Commands using alias (233)

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Short one line while loop that outputs parameterized content from one file to another
There is a common command for outputting a field or list of fields from each line in a file. Why wouldn't you just use cut?

Rename files in batch

Extract audio stream from an video file using mencoder
This command extracts the audio stream of the video in $file and stores it in a file where the original suffix is changed to .mp3

Pick a random line from a file
This is from perldoc -q random.*line, which says: This has a significant advantage in space over reading the whole file in. You can find a proof of this method in The Art of Computer Programming, Volume 2, Section 3.4.2, by Donald E. Knuth. Who am I to argue with Don Knuth?

Automatically connect to a host with ssh once it is online

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" }

Find unused IPs on a given subnet
Somewhat shorter version.

Rename files in batch

cp the file
Copy the file with the given .extension at the source file's location. Eliminates the typing of long paths again and again.

Change proccess affinity.
Set the affinity of a process to a particular core(s). Arguments for processor include a comma separated list, or a range. (example: 1,2 or 0-3) You can use top in smp mode (Press 1) to see the changes to the affinity.


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