In order to create, let's say, 10 directories with a single process we can use the command: mkdir test{1,2,3,4,5,6,7,8,9,10} something extremely boring to type! Why not use seq? seq -s, 1 10 and use its output inside the curly braces? The obvious solution mkdir test{$(seq -s, 1 10)} is, unfortunately, too naive and doesn't work. The answer is the order of the shell expansions (feature of Bourne Shell, actually), where brace expansion happens before command substitution (according to Bash's manual). The solution is to put another level of substitution, using the powerful and mystic command eval. I found the trick in a similar problem in the post at http://stackoverflow.com/questions/6549037/bash-brace-expansion-in-scripts-not-working-due-to-unwanted-escaping

Got the idea from there http://fixunix.com/questions/15902-bash-checking-if-env-var-set.html Show Sample Output

Scan a file and print out a list of ASCII characters that are not used in the file which can then be safely used to delimit fields. Useful when needing to convert CSV files using "," to a single character delimiter. Piping it into less at the end (which could be redundant) stops the command characters being interpreted by the terminal.

Usage: watch ls -l Basic but usable replacement for the "watch" command for those systems which don't have it (e.g. the Solaris I'm trapped on). Type Ctrl+V to escape the following Ctrl+L which clears the screen. It will be displayed as "^L".

If you're using GNIP as as data source provider for Twitter data in their "Activity Streams" format, use this search to pull out the geo coordinates from tweets as "latitude & longitude". You'll find that splunk creates a "multivalued" field out of the "geo.coordinates{}" field from a tweet. A mulitvalued field is an array, so by using "mvindex(field,position_in_array_starting_with_zero), we can create new fields on the fly for lat/lon. Show Sample Output

Creates a directory and then cds into it directly Show Sample Output

Connects to the last adb connection in history. Show Sample Output

echoprint identify your song, then return artist, song name and album name(release) in a JSON. jq parse it and mp3info set the data in your mp3 file. of course it depends on: mp3info jq echoprint You need to set the environment variable export CODEGEN_NEST_API_KEY='YOUR_ECHONEST_KEY_HERE' You can use it with find, but probably will bypass the 120 request/minute of developer account key. So, use a sleep to do it. Something like: find -name \*.mp3 | while read $f; do eval echo $(echoprint-codegen "$f" | jq ' .[0].metadata | "mp3info -a \"" + .artist + "\" -t \"" + .title + "\" -l \"" + .release + "\" \"" + .filename + "\"" ' ) | bash; sleep 1; done

So this first obtains address of the DBUS session, as it's not available by default over SSH. Then it tells plasma-overlay to exit. `kquitapp` is pretty much an equivalent of the qdbus calls.

Additionally you cal also print the current directory in the end. cdb(){ range=$(eval "echo '{1..$1}'"); toPrint="'../%.0s' $range"; printfToEval=$(echo "printf $toPrint"); toCd=$(eval $printfToEval); eval "cd $toCd"; pwd; } Show Sample Output

This command will display the file, but you can change 'cat' to anything else (type 'n' when prompted to cancel the command or anything else to proceed). . Some hints for newbies: type unset bar to make 'bar' function annihilated. For permanent usage you can put this (bar) function in your .bashrc (for bash) or in .profile (for sh). With: . ~/.bashrc you can get all new inserted functions in .bashrc (so the function 'bar' or whatever name you choose) immediately available. Show Sample Output

The result will be a bunch of 'tail' commands running in the background in your current shell.

alias sp='screen -X eval "chdir $PWD"' # save the path in the current sp # create new window ctrl + ] pwd # has same path as last window

bind -x was added in Bash 4.0 so this does not work with Bash 3.2 which comes with macOS.

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Just an alternative for `acpi -b` Show Sample Output

With this command you can use shell variables inside sed scripts. This is useful if the script MUST remain in an external file, otherwise you can simply use an inline -e argument to sed.

VARNAMES='ID FORENAME LASTNAME ADDRESS CITY PHONE MOBILE MAIL ...' cat customer.csv | while read LINE ; do COUNT=1 for VAR in $VARNAMES ; do eval "${VAR}=`echo $LINE | /usr/bin/awk {'print $'$COUNT''}`" let COUNT=COUNT+1 done done Maybe you have a CSV-File with addresses, where you have to process each contact (one per line, write each value to own variable). Of course you can define every variable, but this way is more simple and faster (to write). VARNAMES includes the variable names. Pay attention: the number of names in VARNAMES have to be the same than in the CSV-file the fields. If the CSV is not seperated with ";", you can set the seperator after the awk-binary with -F"_" for example.

This command uses the top voted "Get your external IP" command from commandlinefu.com to get your external IP address. Use this and you will always be using the communities favourite command. This is a tongue-in-cheek entry and not recommended for actual usage.

Tail all logs that are opened by all java processes. This is helpful when you are on a new environment and you do not know where the logs are located. Instead of java you can put any process name. This command does work only for Linux. The list of all log files opened by java process: sudo ls -l $(eval echo "/proc/{$(echo $(pgrep java)|sed 's/ /,/')}/fd/")|grep log|sed 's/[^/]* //g'

Schematics: command [options] [paste your variable here] parameter command [options] [paste entire column of variables here] parameter ... (hard-code command "c" and parameter "e" according to your wishes: in example shown command = "cp -a" and parameter = "~") Features: - Quick exchange only variable part of a long command line - Make variable part to be an entire column of data (i.e. file list) - Full control while processing every single item Hints: Paste column of data from anywhere. I.e. utilize the Block Select Mode to drag, select and copy columns (In KDE Konsole with Ctrl+Alt pressed, or only Ctrl pressed in GNOME Terminal respectively). Disadvantages: You can paste only one single variable in a row. If there are more space separated variables in a row only first one will be processed, but you can arrange your variables in a column instead. To transpose rows to columns or vice versa look at Linux manual pages for 'cut' and 'paste'. TODO: - add edit mode to vary command "c" and parameter "e" on the fly - add one edit mode more to handle every list item different - add y/n/a (=All) instead of only y(=default)/n to allowed answers Disclaimer: The code is not optimized, only the basic idea is presented here. It's up to you to shorten code or extend the functionality. Show Sample Output