Examples

Examples of using `gpg-agent`

Tue, 12 Jan 2021 21:03:09 +0000

Checking the status of `gpg-agent`

$ gpg-agent
gpg-agent[7405]: no gpg-agent running in this session

Starting `gpg-agent`

Find number of files where string ToDo occurs

$ gpg-agent --daemon
$ gpg-agent
gpg-agent[9580]: gpg-agent running and available

Re-starting `gpg-agent`

The gpg-connect-agent is a utility to communicate with a running gpg-agent instance. It can be used to restart gpg-agent:

$ gpg-connect-agent reloadagent /bye
OK
$ gpg-agent
gpg-agent[59922]: gpg-agent running and available
$ gpg-connect-agent reloadagent /bye
OK
$ gpg-agent
gpg-agent[60312]: gpg-agent running and available

Alternatively,

$ gpgconf --kill gpg-agent
$ gpg-agent
gpg-agent[12247]: no gpg-agent running in this session

Examples of using wget

Sun, 03 May 2020 05:47:34 +0000

Download web pages recursively under an URL¹

 wget \
 --recursive \
 --no-clobber \
 --page-requisites \
 --html-extension \
 --convert-links \
 --restrict-file-names=windows \
 --domains example.com \
 -nH --cut-dirs=some_subdir \
 -e robots=off \
 --random-wait \
 --wait 5 \
 --no-parent \
     www.example.com/subdirectory/

Substitute example.com and www.example.com/subdirectory/ with relevant expressions in your problem.
--recursive: download the entire Web site.
--domains website.org: don't follow links outside website.org.
--no-parent: don't follow links outside the directory subdirectory.
--page-requisites: get all the elements that compose the page (images, CSS and so on).
--html-extension: save files with the .html extension.
--convert-links: convert links so that they work locally, off-line.
--restrict-file-names=windows: modify filenames so that they will work in Windows as well.
--no-clobber: don't overwrite any existing files (used in case the download is interrupted and resumed).
-e robots=off: force crawling regardless of robots.txt setting.
-nH --cut-dirs=some_subdir: cuts out hostname and subdirectory name.
--random-wait: randomizes the time between requests to vary between 0.5 and 1.5 times of the waiting time specified by the --wait option.
--wait 5: number of seconds to wait between requests. (See --random-wait.)

References

linuxjournal.com. Downloading an Entire Web Site with wget. 2008. https://www.linuxjournal.com/content/downloading-entire-web-site-wget ↩

Examples of using Evernote

Wed, 11 Mar 2020 18:41:54 +0000

Resync all data

Open Evernote.app on macOS.
Press Shift-Option/Alt and click the synchronization wheel icon next to the search input field (as of Evernote macOS version 7.14 and 2020-3).

Refresh database indices

Press Option/Alt and click menu item 'Option > Troubleshooting'
Click 'Recreate Full Text Search Index' and 'Recreate Spotlight Search Index'.

Examples of using `tree`

Tue, 21 Jan 2020 20:00:14 +0000

Most frequent usage: `tree -N --prune`

$ tree -N --prune

-N: In practice, this option allows many non-ASCII characters printed correctly.
--prune: Remove empty directories recursively from the output.

(END)

tag:tree tag:computing tag:example tag:note

Examples of using afinfo

Thu, 27 Dec 2018 19:29:57 +0000

Get metadata of an audio or video file:

$ afinfo 'some_multimedia_file.m4a''

Get the duration in the unit of seconds:

$ afinfo 'some_multimedia_file.m4a' | awk '/estimated duration/ { print $3 }'

References

https://stackoverflow.com/questions/8933053/check-duration-of-audio-files-on-the-command-line

Examples of using pandoc

Tue, 25 Jul 2017 19:35:27 +0000

Convert a Markdown file to a Mediawiki markup file

$ pandoc -r markdown input.md -t mediawiki -o output.mediawiki

References

http://pandoc.org/MANUAL.html

examples of using 7z

Tue, 16 May 2017 23:59:39 +0000

Create a high-compression-level solid-compression archive in 7z format

7z a -t7z -m0=lzma2 -mx=9 -mfb=64 -md=32m -ms=on dir`date +%Y%m%d%H%M%S`.7z dir

Remarks:

-si gets the input from stdin
-m0=lzma2 use the LZMA2 compression method (See this superuser.com thread for information about LZMA2 method). Use only when GBs of memory is available.
-mx=9 highest compression level
-ms=on creates a solid compression, (tar-based formats that are solid compressions include tar.bz2, tar.gz) TODO

Optionally create a tarball first

$ tar cfv - dir/ | 7z a -si -t7z -m0=lzma2 -mx=9 -mfb=64 -md=32m -ms=on dir`date +%Y%m%d%H%M%S`.tar.7z

Remarks:

- creates the default tarball filename

Create a multi-volume ZIP archive

$ 7z a -tzip -v14m archive.zip largedir/

Create a password protected archive and extract it

$ 7z a -t7z -p myarchive.7z file1.txt file2.png *.cpp

Extract it:

$ 7z x myarchive.7z

Create compressed multi-volume archive of a directory of multiple files and subdirectories

$ 7z a -t7z -mx=5 -v100m largedir ~/Desktop/Downloading/largedir/

7-Zip 9.04 beta  Copyright (c) 1999-2009 Igor Pavlov  2009-05-30
p7zip Version 9.04 (locale=en_US.UTF-8,Utf16=on,HugeFiles=on,2 CPUs)
Scanning

Creating archive largedir.7z

Compressing  largedir/largefile1.avi      
Compressing  largedir/largefile2.avi      
Compressing  largedir/largefile3.avi      
Compressing  largedir/largefile4.avi      

Everything is Ok

Extract

$ 7z e largedir.7z.001

7-Zip 9.04 beta  Copyright (c) 1999-2009 Igor Pavlov  2009-05-30
p7zip Version 9.04 (locale=en_US.UTF-8,Utf16=on,HugeFiles=on,2 CPUs)

Processing archive: largedir.7z.001

Extracting  largedir/largefile1.avi
Extracting  largedir/largefile2.avi
Extracting  largedir/largefile3.avi
Extracting  largedir/largefile4.avi
Extracting  largedir/largefile5.avi
Extracting  largedir

Everything is Ok

Folders: 1
Files: 5
Size:       463073364
Compressed: 104857600
$

Remarks:

-t7z specifies type as 7z
-v100m specifies volume size to be at most 100MB
-mx=5 specifies level of compression in range 0 - 9 with 9 being the most compressed
largedir is the name of the resultant archive, and if multiple volumes are created, the names are largedir.001, largedir.002, etc.

Examples of using Imagemagick

Tue, 16 May 2017 23:59:39 +0000

Checking usage

If you installed GraphicsMagick, do

$ gm
GraphicsMagick 1.3.12 2010-03-08 Q8 http://www.GraphicsMagick.org/
Copyright (C) 2002-2010 GraphicsMagick Group.
Additional copyrights and licenses apply to this software.
See http://www.GraphicsMagick.org/www/Copyright.html for details.

Usage: gm command [options ...]

Where commands include: 
    animate - animate a sequence of images
  benchmark - benchmark one of the other commands
    compare - compare two images
  composite - composite images together
    conjure - execute a Magick Scripting Language (MSL) XML script
    convert - convert an image or sequence of images
    display - display an image on a workstation running X
       help - obtain usage message for named command
   identify - describe an image or image sequence
     import - capture an application or X server screen
    mogrify - transform an image or sequence of images
    montage - create a composite image (in a grid) from separate images
       time - time one of the other commands
    version - obtain release version

Checking basic properties of image

$ identify Mathematica7.png 
Mathematica7.png PNG 1000x1048+0+0 DirectClass 8-bit 1.2M 0.000u 0:01

Geometry is given as <width>x<height>

Converting image format

Convert one image

$ convert source.png destination.jpg

Converting multiple images

$ mogrify -format jpg *.png

Resizing images

Resize to a certain width and height automatically chosen to maintain aspect ratio

$ convert source.jpg -resize 800 destination.jpg

Resize all JPEG files (assuming all have file names *.jpg) in the path

$ mogrify -resize 800 *.jpg

Resize to a certain width and height which has same aspect ratio as the original image

$ convert source.jpg -resize 800x600 destination.jpg

If the geometry specification <widht>x<height> has a aspect ratio different from that of the original. It resizes to a certain width or height, which ever has a larger resizing fraction, and determine the other edge size automatically such that aspect ratio is unchanged

$ convert source.jpg -resize 800x1000000 destination.jpg
$ convert source.jpg -resize 1000000x800 destination.jpg

Resize to a certain percentage

$ convert source.jpg -resize 75% destination.jpg

Compressing image

$ convert big_file.jpg -quality 60% small_file.jpg

Trim off the edges of an image

Removes any edges that are exactly the same color as the pixels at the corner of the image.

$ convert non_trimmed.jpg -trim trimmed.jpg

Examples of using ack

Tue, 16 May 2017 23:59:39 +0000

Find instances of `ToDo` in source files

ack -r Client .

Find number of files where string `ToDo` occurs

ack -l 'ToDo' sourceDirectory | wc -l
  12

Find string `"FooBar"` in any `.*` files ignoring certain directories

$ pwd
/User/lumeng
$ ack --type=matlab --ignore-dir={subdir1,subdir2} "\"FooBar\""

Remarks:

/User/lumeng/subdir1, /User/lumeng/subdir2 are not searched;
--type=matlab specifies that files with file name extension .m is searched; Check ack --help=type for complete list of types;

Find `Plot` in Mathematica and related source code files

ack --type-add=wolfram:ext:.m,.nb,.cdf,.mt,.wl,.wlt --wolfram Plot

Optionally, add --type-add=wolfram:ext:.m,.nb,.cdf,.mt,.wl,.wlt to a ${HOME}/.ackrc and ue

ack --wolfram Plot
ack --nowolfram Plot

Examples of using awk

Tue, 16 May 2017 23:59:39 +0000

Count number of lines

Count number of lines in a text file:

$ awk '{print NR}' file.txt

This will give correct answer even if there is no EOL character at the last line. In contrast wc -l file.txt would give wrong answer (1 less) in that case.

Examples of using Bash

Tue, 16 May 2017 23:59:39 +0000

Rename multiple files

Remove "-2" from names of multiple files

$ ls
R0012455-2.jpg  R0012462-2.jpg  R0012466-2.jpg
$ for i in *.jpg; do mv -i "$i" "${i/\-2/}"; done
$ ls
R0012455.jpg    R0012462.jpg    R0012466.jpg

References

`echo`

Enable backslash-escaped characters

$ echo "line1\nline2"
line1\nline2
$ echo -e "line1 \n line2"
line1 
line2

`read`

pause until user press a key

read -p "Press any key to continue ..."

Interate over a list of values

bash$ for i in {6,8,9,11}; do wget "http://www.weilishi.org/img/0401/$i.jpg"; done

Remarks:

Notice that {6, 8, 9, 11} which contains white spaces does not work.

Examples of using command-line

Tue, 16 May 2017 23:59:39 +0000

`cd`

Return to previous path:

cd -

Notes

References

External links

Examples of using curl

Tue, 16 May 2017 23:59:39 +0000

Check TCP handshake and SSL handshake time cost for a domain

curl -w "TCP handshake: %{time_connect}, SSL handshake: %{time_appconnect}\n" -so /dev/null https://www.wolfram.com

References:

Download multiple files

curl -O http://www.cs.berkeley.edu/~sinclair/cs271/n[1-3].pdf

References

Examples of using CVS

Tue, 16 May 2017 23:59:39 +0000

Check out a module and name the root directory different

$ cvs checkout -d localDirName remoteModuleName
<snip>
$ ls
$ localDirName

By default

$ cvs checkout remoteModuleName
<snip>
$ ls
remoteModuleName

`.cvsignore`

To ignore a subdirectory subdir in directory dir

delete text D/subdir//// if it exists from file ../dir/CVS/Entries
add text subdir in file ../dir/.cvsignore
refresh cvs status -l

Replace a file with the latest version from the repository

cvs update -C someFile

References

Open Source Development with CVS

External links

examples of using du

Tue, 16 May 2017 23:59:39 +0000

Display the sizes of directories and files in current path

$ du -hcs *
8.6G    dir1
838M    dir2
1.5M    file1
 56K    file2

-h to use human-readable sizes
-c to display a total size
-s to display sizes only for directories and files directly under the current path but not in any subdirectory

Examples of using Eclipse

Tue, 16 May 2017 23:59:39 +0000

Uninstalling plug-in

Preferences → Install/Update → Uninstall or update software that is already installed → select some plug-ins → click Uninstall

Move a project's directory

Suppose you have a project 'project1' which is at path /home/XXX/workspace/project1/ and you want to move it to /home/XXX/workspace/group/project1/.

In order to avoid destroying the metadata of the project such as working sets and .project file, use the refactor function in the menu rather than deleting and recreating the project.

Create the directory /home/XXX/workspace/group/.
Use menu Windows > Views > Other > Navigator.
Right click on the project of interest in the Navigator view.
Choose refactor > move, and select the new path /home/XXX/workspace/group/, and click OK.

Change a CVS repository to use 'ext' connection method

By default a CVS repostiory created in Eclipse uses a non-standard connection method 'extssh'. To change an existing project to use 'ext' connection method,

Window > Open Perspective > CVS Repository Exploring > add a CVS repository with same setup as the 'extssh' repository but this time specify 'ext' as connection method.
Preferences > Team > CVS > Ext Connection Method > check 'Use another connection method type to connect', choose 'connection type' as 'extssh'.
Open Window > View > Navigator, in the Navigator view, right click on the interested project, go to menu Properties > CVS > Change Sharing > choose the CVS repository with 'ext' connection method.

Using the same physical directory as projects in different workspaces

Git clone (or CVS check out) a version controlled project to a centralized location on one's computer.
In each Eclipse workspace that you need the repository or project, use the menu "File > Import... General: Existing Projects in Workspace" to import the repository, but point it to the directory prepared in the last step. Make sure the "copy projects into workspace" checkbox is unchecked.

Notes

References

External links

Examples of using Emacs

Tue, 16 May 2017 23:59:39 +0000

Viewing

Highlight all lines matching a regex

Highlight all lines wider than 79 columns:

m-x highlight-lines-matching-regexp

.\{80\}

Replace

Remove empty lines

M-%: Query replace string (query-replace).
C-q: Quote - enter original string now.
C-j, C-j: Two continuous ^J characters. (Note an empty line is two continuous newline characters.)
C-q: Quote —— enter replacement string now.
C-j: ^J character. (Replace empty line with one newline character.)

Replace lines with string substituted

To replace lines like

echo "[INFO]example: 'development'"

with

read -p "examples: 'development':" -e INPUT

press key combination M-x and type in the command query-replace-regexp, or use the key binding for that: C-M-%
type in regex pattern ^echo \"\[INFO\]example: $.*$\", and press Enter
type in replacement pattern read -p "examples: \1" -e INPUT, and press Enter
- Special characters in Emacs Lisp regex are ., *, +, ?, [, ^, $, and \. ] is special if it matches an earlier [ and ends a character alternative. - is special inside a character alternative. [: and balancing :] enclosing a character class are special. Any other character appearing in a regular expression is ordinary, unless a \ precedes it.
- There are back slash constructs.
- \": I'm actually not sure why " needs escaping here.
- \[ and \]: needs escaping since [ and ] are special characters but it is the literal characters that needs matching.
- $ and $: needs escaping since ( and ) are non-special characters in Emacs Lisp regular expression, and needs escaping to use its special function as a back slash construct.
- \1 refers to the first matched group associated with $.*$.

Here is a list of examples for this type of replacing:

(examples to be added)

Replace multiple continuous whitespaces inbetween words with one whitespace

Replace regexp `\b[:space:]+\b with ' ' (don't include the two ').

Comment out lines of form `{"OriginalString", "Unit"} -> ".*"` in Mathematica code

Query replace regexp \({"OriginalString", "Unit"} -> ".*"\)$ with: (* \1 *)

Resolving version control repository merge conflicts

When resolving merge conflicts for files in version control repositories, oftentimes, one need to keep the top or bottom halves for all the conflict blocks of form

<<<<<<< XXX top code block line 1 top code block line 2

top code block line 3

bottom code block line 1 bottom code block line 2 bottom code block line 3

YYY

Check and change file encoding

Check the coding system of the file opened in the current buffer:

describe-coding-system

or with keybinding

C-h C

Save the buffer in file using a different encoding:

C-x C-m f

or force it in situ in the buffer immediately

C-x C-m c utf-8 Ent C-x C-w Ent

Revert a buffer from file using a different coding system:

revert-buffer-with-coding-system

or with keybinding

C-x Ent r

References

http://emacswiki.org/emacs/ChangingEncodings

http://www.gnu.org/software/emacs/manual/html_node/emacs/Specify-Coding.html

Editing

Edit a remote file

Press keys C-x C-f to bring cursor into the Emacs mini-buffer, type

/ssh:username@hostname.com:/path/to/file.txt

and Ent.

Customization

M-x customize-group Ent whitespace Ent to enter into a buffer to customize whitespace mode options.

Modes that I use often

`mediawiki-mode`

C-F5: open new page.
A-g: refresh buffer with remote content, discarding local changes.

erc mode to chat in IRC

M-x erc-select
...
/join #haskell

Note

C- is Ctrl- in most cases.
M- is Alt- in most cases.
In Emacs ^J is newline character.

References

34.3.1.3 Backslash Constructs in Regular Expressions, GNU Emacs manual
19.9.4 Query Replace, GNU Emacs manual * [http://elpa.gnu.org/packages/ GNU Emacs Lisp Package Archive (ELPA) packages]. This *is standard Emacs' built-in repository of FSF sanctioned Emacs packages.

External links

Examples of using ffmpeg

Tue, 16 May 2017 23:59:39 +0000

Convert mp4 to avi

$ ffmpeg -i infile.mp4 outfile.avi

Resize a video or image

Resize a video such that its width is 1080 pixels and the aspect ratio is maintained, hence the height parameter is -1:

$ ffmpeg -i input.mp4 -vf scale=1080:-1 output.mp4

Convert to a specificed bitrate

$ ffmpeg -i input.avi -b 64k output.avi

Convert WAV audio file to MP3 format at a specified audio bitrate

$ ffmpeg -i input.wav -acodec mp3 -ab 128k output.mp3

Convert mp3 audio file to Orbvis format at a specified audio bitrate

$ ffmpeg -i input.mp3 -acodec libvorbis -crf 15 output.ogg

-crf: Use Constant Rate Factor to keep the best quality and don't care about the file size. The range of the CRF scale is 0–51, where 0 is lossless, 23 is the default, and 51 is worst quality possible.

Convert avi file to specified audio sampling rate (22050 Hz), audio bitrate (32 kbps), and frame size (640x480)

$ ffmpeg -i input.avi -ar 22050 -ab 32 -s 640×480 video.mp4

One can use named frame sizes such as

-s vga

Combine multiple files into one file

$ ffmpeg -safe 0 -f concat -i ./my_file_list.txt -c copy output_file.mp3

my_file_list.txt is

# some comment
file './part_file_1.mp3'
file './part_file_2.mp3'
file './part_file_3.mp3'

Trim a video or audio according to starting and ending times

ffmpeg -ss hh:mm:ss -to hh:mm:ss -i 'input.mp4' -c copy output.mp4

Options

See formats and codecs available on your computer

$ ffmpeg -formats

References

https://opensource.com/article/17/6/ffmpeg-convert-media-file-formats
Converting video & audio files using ffmpeg in GNU/Linux
ffmpeg.org documentation: main options
ffmpeg.org documentation: video options
ffmpeg.org documentation: audio options

External links

Examples of using find

Tue, 16 May 2017 23:59:39 +0000

Basic examples

Find files by name

Find files in current path and its subdirectories which has FooBar in its file name:

$ find . -name *FooBar*

Allow both FooBar and foobar to be found by ignoring letter case:

$ find . -iname *FooBar*

$ find . -iname *foobar*

Find empty directories

find . -type d -empty

Find broken symbolic links

find -L . -type l

Remarks:

-L option let find resolve/follow symbolic links when possible.
-type l option selects only symbolic link files.

Only symbolic link files whose destination is missing or itself a symbolic link file will be found.

Find symbolic links matching a pattern

Find in the current path any symbolic link whose name contains 'foobar':

find . -lname '*foobar*'

Case-insensitive:

find . -ilname '*foobar*'

Find duplicate files

In a bash script:

#!/usr/bin/env bash

FILENAME=`basename $0`

DATETIME=`date +%Y%m%d%H%M%S`

TMPFILE=`mktemp /tmp/${FILENAME}.${DATETIME}` || exit 1

find . \! -type d -exec cksum {} \; | sort | tee $TMPFILE | cut -f 1,2 -d ' ' | uniq -d | grep -if - $TMPFILE | awk '{print $3}'

Comment:

- is Bash special character which means redirection from/to stdin or stdout
tee $TMPFILE copies stdout stream into the temporary file and pass along it through a pipe
uniq -d keeps the duplicated entries, i.e. files with same checksum value and file size

Find large backup files to delete to free up disk space

$ find data -name *~ -size +100000k -exec ls -lhtc '{}' \;
-rw-r--r--  1 foobar  _lpoperator   390M May  7 21:30 data/file1.txt~
-rw-r--r--  1 foobar  _lpoperator   253M May  7 21:30 data/file2.txt~
$ find data -name *~ -size +100000k -exec rm -i '{}' \;
remove data/file1.txt~? y
remove data/file2.txt~? y

Find large files

Say your disk is running out of space and you want to find the large files which potentially can be removed:

$ find -P -O2 . -type f -size +100M -user $USER -exec ls -sh '{}' >> $OUTPUTFILE \;

-P: use option to never follow symbolic links
-O2: use option to apply query optimization level 2, not available for some platforms including macOS 10.6
.: search in current path
-type f: test file type is regular file
-size +100M: test file size is larger than 100M
-user $USER: test file owner is $USER
-exec ls -sh '{}' >> $OUTPUTFILE: execute command to save info to file

Find `.DS_Store` files and remove them from version control repository

Suppose we use git

$ find . -name .DS_Store -print0 | xargs -0 git rm --ignore-unmatch -f
rm '.DS_Store'
rm 'Computing/.DS_Store'
rm 'Computing/Programming/.DS_Store'
rm 'Computing/Programming/Cpp/.DS_Store'
rm 'Computing/Software/.DS_Store'
rm 'Project/.DS_Store'

Remarks:

-print0: print all output on same line
-f: to force removal
--ignore-unmatch: perform removing only if the file is in the Git repository

Find recently modified files in a directory recursively

find . -type f -exec stat -f "%m%t%Sm %N" '{}' \; | sort -rn | head -20 | cut -f2-

If one installs GNU find, i.e. the findutils package on MacPorts, one can use its -printf option to print access time in sortable form and them sort the lines numerically:

gfind . -type f -printf '%A+\t%p\n' | sort -n

To remove the annoying fractional seconds parts:

gfind -type f -printf '%A+\t%p\n' | sed 's/\.<span class="createlink">:digit:</span>\{10\}//' | sort -n
gfind -type f -printf '%A+\t%p\n' | cut --complement -c 20-30 | sort -n

List files in a directory recursively and sort by modification time

Print files and dates:

find . -type f -exec stat -f "%m%t%Sm %N" '{}' \; | sort -rn | head -20 | cut -f2-

Print file full paths only:

find "$PWD" -type f -exec stat -f $'%m\t%N' '{}' \; | sort -rn | cut -f2

Get the total size of files with name matching a given pattern

find . -name "foobarREGEX.txt" -ls | awk '{total += $7} END {print total}'

Notes

References

External links

Examples of using Gmail

Tue, 16 May 2017 23:59:39 +0000

Find emails from some one excluding chats

In the search bar, query

from:FOOBAR@gmail.com -is:Chats

Find chats with someone:

from:FOOBAR@gmail.com is:Chats

Examples

Examples of using `gpg-agent`

Checking the status of gpg-agent

Starting gpg-agent

Re-starting gpg-agent

Examples of using wget

Download web pages recursively under an URL1

References

Examples of using Evernote

Resync all data

Refresh database indices

Examples of using `tree`

Most frequent usage: tree -N --prune

Examples of using afinfo

References

Examples of using pandoc

Convert a Markdown file to a Mediawiki markup file

References

examples of using 7z

Create a high-compression-level solid-compression archive in 7z format

Optionally create a tarball first

Create a multi-volume ZIP archive

Create a password protected archive and extract it

Create compressed multi-volume archive of a directory of multiple files and subdirectories

Examples of using Imagemagick

Checking usage

Checking basic properties of image

Converting image format

Resizing images

Compressing image

Trim off the edges of an image

Examples of using ack

Find instances of ToDo in source files

Find number of files where string ToDo occurs

Find string "FooBar" in any .* files ignoring certain directories

Find Plot in Mathematica and related source code files

Examples of using awk

Count number of lines

Examples of using Bash

Rename multiple files

Remove "-2" from names of multiple files

References

echo

Enable backslash-escaped characters

read

pause until user press a key

Interate over a list of values

Examples of using command-line

cd

Notes

See also

References

External links

Examples of using curl

Check TCP handshake and SSL handshake time cost for a domain

Download multiple files

References

Examples of using CVS

Check out a module and name the root directory different

.cvsignore

Replace a file with the latest version from the repository

References

External links

examples of using du

Display the sizes of directories and files in current path

Examples of using Eclipse

Uninstalling plug-in

Move a project's directory

Change a CVS repository to use 'ext' connection method

Using the same physical directory as projects in different workspaces

Notes

See also

References

External links

Examples of using Emacs

Viewing

Highlight all lines matching a regex

Replace

Remove empty lines

Replace lines with string substituted

Checking the status of `gpg-agent`

Starting `gpg-agent`

Re-starting `gpg-agent`

Download web pages recursively under an URL¹

Most frequent usage: `tree -N --prune`

Find instances of `ToDo` in source files

Find number of files where string `ToDo` occurs

Find string `"FooBar"` in any `.*` files ignoring certain directories

Find `Plot` in Mathematica and related source code files

`echo`

`read`

`cd`

`.cvsignore`

Comment out lines of form `{"OriginalString", "Unit"} -> ".*"` in Mathematica code

`mediawiki-mode`

Find `.DS_Store` files and remove them from version control repository