Commands by mttiger2022 (0)

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Get your external IP address
curl ifconfig.me/ip -> IP Adress curl ifconfig.me/host -> Remote Host curl ifconfig.me/ua ->User Agent curl ifconfig.me/port -> Port thonks to http://ifconfig.me/

find files containing text
I find this format easier to read if your going through lots of files. This way you can open the file in any editor and easily review the file

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"

How many files in the current directory ?
A simple "ls" lists files *and* directories. So we need to "find" the files (type 'f') only. As "find" is recursive by default we must restrict it to the current directory by adding a maximum depth of "1". If you should be using the "zsh" then you can use the dot (.) as a globbing qualifier to denote plain files: zsh> ls *(.) | wc -l for more info see the zsh's manual on expansion and substitution - "man zshexpn".

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" }

Print a list of standard error codes and descriptions.
Written by jmcnamara Taken from http://www.perlmonks.org/?node_id=274896

df without line wrap on long FS name
-P uses the POSIX output format, which makes information on each file system always printed on exactly one line. "column -t" makes a table from the input.

Find files that are older than x days
Find files that are older than x days in the working directory and list them. This will recurse all the sub-directories inside the working directory. By changing the value for -mtime, you can adjust the time and by replacing the ls command with, say, rm, you can remove those files if you wish to.

Remove the first and the latest caracter of a string

Count TCP States From Netstat
Counts TCP states from Netstat and displays in an ordered list.

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