Commands using seq (113)

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Change prompt to MS-DOS one (joke)
This one eliminates the additional backslash at the end (which is not necessary)

Swap the two last arguments of the current command line
Say you just typed a long command like this: $ rsync -navupogz --delete /long/path/to/dir_a /very/long/path/to/dir_b but you really want to sync dir_b to dir_a. Instead of rewriting all the command line, just type followed by , and your command line will read $ rsync -navupogz --delete /very/long/path/to/dir_b /long/path/to/dir_a

Job Control
background and disown, but with a proper one-line syntax

count how many times a string appears in a (source code) tree
grep -o puts each occurrence in a separate line

Change a specific value in a path
Awk replaces the value of a specific field while retaining the field separator "/" .

Terminal redirection
can display the commands and their output to another user who is connected to another terminal, by example pts/3

Find the package that installed a command

list all files in a directory, sorted in reverse order by modification time, use file descriptors.
It's both silly, and infinitely useful. Especially useful in logfile directories where you want to know what file is being updated while troubleshooting.

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" }

BASH: Print shell variable into AWK


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