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Simplest way to get size (in bytes) of a file

draw matrix using dot

enable all bash completions in gentoo

ignore hidden directory in bash completion (e.g. .svn)

Flush and then immediately start watching a file
This is useful for keeping an eye on an error log while developing. The !^ pulls the first arg from the previous command (which needs to be run in a sub-shell for this shortcut to work).

delete PBS jobs based on strings from qstat output

Convert seconds to [DD:][HH:]MM:SS
Converts any number of seconds into days, hours, minutes and seconds. sec2dhms() { declare -i SS="$1" D=$(( SS / 86400 )) H=$(( SS % 86400 / 3600 )) M=$(( SS % 3600 / 60 )) S=$(( SS % 60 )) [ "$D" -gt 0 ] && echo -n "${D}:" [ "$H" -gt 0 ] && printf "%02g:" "$H" printf "%02g:%02g\n" "$M" "$S" }

reverse order of file
awk reverse order of lines (emulates "tac")

Show crontabs for all users
This is flatcaps tweaked command to make it work on SLES 11.2

Search some text from all files inside a directory


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