Commands using sleep (289)

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Show max lengths of all fields in a pipe delimited file with header row

Advanced python tracing
Trace python statement execution and syscalls invoked during that simultaneously

search string in _all_ revisions

tail a log over ssh
This is also handy for taking a look at resource usage of a remote box. $ ssh -t remotebox top

Mirror rubygems.org
https://github.com/rubygems/rubygems-mirror/issues/20

Create a bunch of dummy text files

create an uncompressed tar file of each child directory of the current working directory
First, use find to find directories exactly one level below current directory, then create a tar file using the directory as the basename.

Perform a branching conditional
This will perform one of two blocks of code, depending on the condition of the first. Essentially is a bash terniary operator. To tell if a machine is up: $ ping -c1 machine { echo succes;} || { echo failed; } Because of the bash { } block operators, you can have multiple commands $ ping -c1 machine && { echo success;log-timestamp.sh }|| { echo failed; email-admin.sh; } Tips: Remember, the { } operators are treated by bash as a reserved word: as such, they need a space on either side. If you have a command that can fail at the end of the true block, consider ending said block with 'false' to prevent accidental execution

Recursively change permissions on files, leave directories alone.

Number of CPU's in a system
/proc/cpuinfo contains information about the CPU. Search for "processor" in the /proc/cpuinfo file wc -l, counts the number of lines.


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