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To create files with specific permission:

generate a telephone keypad
seems a useless command ...

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" }

Transforms a file to all uppercase.
Transforms a file to all uppercase.

Calculate pi to an arbitrary number of decimal places

zsh only: access a file when you don't know the path, if it is in PATH
Say you want to execute 'file' on the command 'top' (to determine what type of file it is); but you don't know where 'top' resides: preface the argument with = and zsh will implicitly prepend the path.

Put a console clock in top right corner
Gives not only date but also some interesting status about the System

geoip information
That makes a function you can put in your ~/.bashrc to run it when you need in any term with an IP as argument

check open ports without netstat or lsof

take a look to command before action
add |sh when you agree the list, I often use that method to prevent typos in dangerous or long operations


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