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tstouch takes two arguments: a filename containing a timestamp, and an extended regular expression with the parenthesized section matching a timestamp of the form YYYYMMDDhhmm or YYYYMMDDhhmm.ss.
It then touches the file with that timestamp.
capture 2000 packets and print the top 10 talkers
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.
Add this to .vimrc to automatically give scripts with a shebang (e.g., #!/usr/bin/perl) executable permissions when saving.
Found @ http://stackoverflow.com/questions/817060/creating-executable-files-in-linux/817522#817522
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"
}
Convert some SVG files into PNG using ImageMagick's convert command.
Run the conversions in parallel to save time.
This is safer than robinro's forkbomb approach :-)
xargs runs four processes at a time -P4
This is the setup I'm using for my largest project. It gives 357 lines per page (per side), which makes it fairly easy to carry around a significant amount of code on a few sheets of paper. Try it.
(I stick to the 80 column convention in my coding. For wider code, you'll have to adjust this.)
Works on CentOS ad OpenBSD too, display time of accounts connection on a system, -p option print individual user's statistics.
By setting the UNIX95 variable in HP-UX the XPG4 mode is activated, you get new options for ps and other commands, for me the best way to use this is to create an alias named ptree in root profile: alias ptree='UNIX95=1 ps -eH'
If you want a visual representation of the parent/child relationships between processes, this is one easy way to do it. It's useful in debugging collections of shell scripts, because it provides something like a call traceback.
When a shell script breaks, just remember "awwfux".