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convert unixtime to human-readable with awk
- convert unixtime to human-readable with awk - useful to read logfiles with unix-timestamps, f.e. squid-log: sudo tail -f /var/log/squid3/access.log | awk '{ print strftime("%c ", $1) $0; }

output the contents of a file removing any empty lines including lines which contain only spaces or tabs.

Automatically find and re-attach to a detached screen session
-RR option is used to resume the first appropriate detached screen session

Recompress all .gz files in current directory using bzip2 running 1 job per CPU core in parallel

strip non-constant number of directories from tar archive while decompressing
If you want to decompress the files from an archive to current directory by stripping all directory paths, use --transform option to strip path information. Unfortunately, --strip-components option is good if the target files have same and constant depth of folders. The idea was taken from http://www.unix.com/solaris/145941-how-extract-files-tar-file-without-creating-directories.html

Insert the last argument of the previous command
for example if you did a: $ ls -la /bin/ls then $ ls !$ is equivalent to doing a $ ls /bin/ls

restart apache only if config works
making lots of configurations to apache and restarting the server only to find it broken just plain sucks.

Find the package that installed a command

See your current RAM frequency
man dmidecode [look for type]

Selecting a random file/folder of a folder
Also looks in subfolders


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