Commands by richard (5)

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a find and replace within text-based files, for batch text replacement, not using perl
Use sed to edit in-place a list of files returned by find.

list block devices
Shows all block devices in a tree with descruptions of what they are.

Fast search in man files or bz-files by keyword direct by man or bz files
For example we need find fast where located and described keyword COMMIT_EDITMSG in man files. Here example howto solve it by search with command bzgrep in man files. Generally these files in bz compressed format. You can use another keywords to your search. Common syntax is: bzgrep -lE keyword1 /usr/share/man/man?/optional-keyword-to-refine* or bzgrep -lE keyword1 /usr/share/man/man?/* where optional-keyword-to-refine is optional and may be omitted but used to speedup search Of course you may combine other options for bzgrep (its based on grep)

Job Control
background and disown, but with a proper one-line syntax

python2 -m CGIHTTPServer
In case you need to test some CGI scripts this does the job. It also has the functionality of a http server. Enjoy!

List of macros defined by gcc
Lists all macros and their values defined by gcc.

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" }

notify yourself when a long-running command which has ALREADY STARTED is finished
If you want to be notified when a long-running command is finished, but you have already started it: CTRL+Z $ fg; echo "finished" | sendmail me@example.com I use a script to post a tweet, which sends me a txt: $ fg; echo "finished" | tweet

List your sudo rights
List the commands you have the right to use with sudo.

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"


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