Commands tagged random (97)

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list all file extensions in a directory
If your grep doesn't have an -o option, you can use sed instead.

Skip filenames with control characters, a.k.a tab,newline etc

Find out how old a web page is
I used to use the Firefox "View page info" feature a lot to determine how stale the web page I was looking at was. Now that I use mostly Chrome I miss that feature, so here is a command line alternative using wget. The -S says to display the server response, the --spider says to not download any files/pages, just fetch the header. The output goes to stderr, so to grep it you use 2>&1 to combine the stderr stream with stdout, the pipe that to grep for Last-Modified. You can use curl instead if you have it installed, like this: $ curl --head -s http://osswin.sourceforge.net | grep Mod

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" }

Adjust all EXIF timestamps in .mov by +1 hour
works for Powershot SD780 IS

Clean the /boot directory
On Fedora clean the boot directory; erase older kernel

Find the package that installed a command

Convert CSV to JSON
Replace 'csv_file.csv' with your filename.

Erase empty files
The command find search commands with size zero and erase them.

Install pip with Proxy
Installs pip packages defining a proxy


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