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Encrypted archive with openssl and tar
Create an AES256 encrypted and compressed tar archive. User is prompted to enter the password. Decrypt with: $ openssl enc -d -aes256 -in | tar --extract --file - --gzip

Which processes are listening on a specific port (e.g. port 80)
swap out "80" for your port of interest. Can use port number or named ports e.g. "http"

cpu and memory usage top 10 under Linux
It's like `prstat -t` under Solaris

list files recursively by size

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" }

Cleanly manage tempfiles in scripts
Cleanly create tempfiles using mktemp and remove them using traps instead of removing them in the end of the script. This way, you make sure the tempfiles are removed properly even if the script is killed or interrupted. For a user script in KDE4, you can set TMPROOT using : $ TMPROOT=$(kde4-config --path tmp)

Find the package that installed a command

Number of files in a SVN Repository
Number of files in a SVN Repository This command will output the total number of files in a SVN Repository.

Which processes are listening on a specific port (e.g. port 80)
swap out "80" for your port of interest. Can use port number or named ports e.g. "http"

Convert string to uppercase


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