Commands tagged shell function (6)

  • Display all shell functions set in the current shell environment

    Uses the shell builtin `declare` with the '-f' flag to output only functions to grep out only the function names. You can use it as an alias or function like so: alias shfunctions="builtin declare -f | command grep --color=never -E '^[a-zA-Z_]+\ \(\)'" shfunctions () { builtin declare -f | command grep --color=never -E '^[a-zA-Z_]+\ \(\)'; } Show Sample Output


    2
    builtin declare -f | command grep --color=never -E '^[a-zA-Z_]+\ \(\)'
    sciro · 2018-07-23 05:24:04 1180
  • command shell generate random strong password

    shell generate random strong password Show Sample Output


    2
    len=20; tr -dc A-Za-z0-9_ < /dev/urandom | head -c ${len} | xargs
    aysadk · 2019-04-16 20:20:46 39
  • Extract content between the first " and the last " double quotes

    Thanks to this user: https://stackoverflow.com/a/35636373/2394635 Show Sample Output


    1
    s='Test "checkin_resumestorevisit \"- "Online_V2.mt" Run'; s=${s#*'"'}; s=${s%'"'*}; echo "$s"
    bugmenot · 2022-01-08 16:16:18 891
  • ..(), go up in directory tree, func to long please refer to description

    many have aliases like: alias ...="cd ../../" alias ....="cd ../../../" and so furth. ..() mitigates to need for those aliases, see sample output for an example # .. -> go up 1 directory # .. 4 -> go up 4 directories ..() { local DIR='' declare -i NUM=0 if [[ ${1} =~ ^[1-9][0-9]*$ ]] then while (( ${NUM} < ${1:-1} )) do DIR="${DIR}../" NUM=$(( ${NUM} + 1 )) done else DIR=.. fi cd "${DIR}" } Show Sample Output


    -4
    [ ~/temp/foo/bar/baz ] $ .. 3
    Xk2c · 2015-01-01 20:41:17 11
  • check4progs(), func to long please refer to description

    Thanks to the great grml team for this func! You really should look at their shell configs for further usefull things! http://git.grml.org/?p=grml-etc-core.git;a=blob_plain;f=etc/grml/script-functions;h=4d6bcea8f9beae83abd08f44155d299ea54a4a9f;hb=HEAD # {{{ check for availability of program(s) # usage example: # check4progs [-s,-q,--quiet,--silent] arg [arg .... argn] # # with option given either of: # -s,-q,--quiet,--silent # # check for available progs but produce no output check4progs() { [ -n "${ZSH_VERSION}" ] && emulate -L sh local RTN=0 local oldifs="${IFS}" local ARG d found local VERBOSE=1 case ${1} in -q | -s | --quiet | --silent) VERBOSE=0 shift 1 ;; *) ;; esac while [ $# -gt 0 ] do ARG="$1" shift found=0 IFS=: for d in $PATH do if [ -x "${d}/${ARG}" ] then found=1 break fi done IFS="${oldifs}" # check for availability if [ ${found} -eq 0 ] then if [ ${VERBOSE} -eq 1 ] then printf "%s: binary not found\n" "${ARG}" >&2 fi RTN=1 fi done # return non zero, if at least one prog is missing! return $RTN } # }}} Show Sample Output


    -6
    $ if check4progs cp foo mv bar rsync; then echo "needed progs avail, lets do funky stuff"; else echo "oh oh better abort now"; fi
    Xk2c · 2015-01-01 16:16:00 9
  • cd(), do a ls (or whatever you can imagine) after a cd, func to long please refer to description

    some people on the net already use a cd(), but most of them break 'cd -' functionality, that is "go back where you have been previosly", or 'cd' which is "go back home". This cd() copes with that. Also when given a file name, go to the directory where this file is in. cd() { if [[ -n ${*} ]] then if [[ s${*}e == s-e ]] then builtin cd - elif [[ ! -d ${*} ]] then builtin cd "${*%/*}" else builtin cd "${*}" fi else builtin cd ~ fi ls -la }


    -6
    cd(), do a ls (or whatever you can imagine) after a cd, func to long please refer to description
    Xk2c · 2015-01-01 20:50:19 10

What's this?

commandlinefu.com is the place to record those command-line gems that you return to again and again. That way others can gain from your CLI wisdom and you from theirs too. All commands can be commented on, discussed and voted up or down.

Share Your Commands

Check These Out

Batch convert PNG to JPEG
Convert all PNG images in directory to JPEG using ImageMagick, and delete the old PNG images.

Remove all unused kernels with apt-get
This will remove all installed kernels on your debian based install, except the one you're currently using. From: http://tuxtweaks.com/2009/12/remove-old-kernels-in-ubuntu/comment-page-1/#comment-1590

Takes and displays screenshot of Android phone over adb.
Dependencies on phone: adb access, screencap command, base64 command. Dependencies on computer: adb, sed, base64, display (from imagemagick, but can substitute other image viewer which reads from stdin). This should work around adb stupidies (i.e. that it replaces \n with \r\n) with base64.

File rotation without rename command
Rotates log files with "gz"-extension in a directory for 7 days and enumerates the number in file name. i.e.: logfile.1.gz > logfile.2.gz I needed this line due to the limitations on AIX Unix systems which do not ship with the rename command.

Rename files in batch

Read aloud a text file in Mac OS X

list ips with high number of connections

Better git diff, word delimited and colorized
I've been using colordiff for years. wdiff is the new fav, except its colors. Word delimited diffs are more interleaved, easing the chore of associating big blocks of changes.

Pipe stdout and stderr, etc., to separate commands
You can use [n]> combined with >(cmd) to attach the various output file descriptors to be the input of different commands.

Find usb device in realtime
Using this command you can track a moment when usb device was attached.

Stay in the loop…

Follow the Tweets.

Every new command is wrapped in a tweet and posted to Twitter. Following the stream is a great way of staying abreast of the latest commands. For the more discerning, there are Twitter accounts for commands that get a minimum of 3 and 10 votes - that way only the great commands get tweeted.

» http://twitter.com/commandlinefu
» http://twitter.com/commandlinefu3
» http://twitter.com/commandlinefu10

Subscribe to the feeds.

Use your favourite RSS aggregator to stay in touch with the latest commands. There are feeds mirroring the 3 Twitter streams as well as for virtually every other subset (users, tags, functions,…):

Subscribe to the feed for: