commandlinefu.com is the place to record those command-line gems that you return to again and again.
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Every new command is wrapped in a tweet and posted to Twitter. Following the stream is a great way of staying abreast of the latest commands. For the more discerning, there are Twitter accounts for commands that get a minimum of 3 and 10 votes - that way only the great commands get tweeted.
Use your favourite RSS aggregator to stay in touch with the latest commands. There are feeds mirroring the 3 Twitter streams as well as for virtually every other subset (users, tags, functions,…):
Subscribe to the feed for:
Adjust the --resolution and --mode as required (if these options are available for your scanner).
The size options (-x, -y, -imageheight, -imagewidth) are for US letter paper. For A4, I think the command would be:
scanimage -p --resolution 250 --mode Gray -x 210 -y 297 | pnmtops -imageheight 11.7 -imagewidth 8.3 | ps2pdf - output.pdf
manswitch grep -o
This will take you to the relevant part of the man page, so you can see the description of the switch underneath.
sleep 1h ; sudo command
sudo sleep 1h ; sudo command
won't work, because by the time the delay is up, sudo will want your password again.
I created this so I could send myself an email alert when a long-running job was finished, e.g.,
my_long_job.exe ; quickemail my_long_job.exe has finished
Use -W to adjust the width of the output, and --suppress-common-lines to show only the lines that have been changed.
I found out about this from Unix Power Tools, and thought it was pretty useful.
Use the -w option to change the width of the output, and the -s option to suppress lines that are the same in both files.