Write comments to your history.

comment() { echo "" > /dev/null; }
A null operation with the name 'comment', allowing comments to be written to HISTFILE. Prepending '#' to a command will *not* write the command to the history file, although it will be available for the current session, thus '#' is not useful for keeping track of comments past the current session.
Sample Output
$ comment -- working on project 497
$ history
...
 9957  May/03 - 12:10:11 comment -- working on project 497
 9958  May/03 - 12:11:08 history


5
By: bartonski
2010-05-03 16:14:04

What Others Think

Hmm... That's a strange thing to do. However, you can make it simpler: comment() { :; } : (colon) does nothing and returns true. Alternatively, just do # This is a comment
flatcap · 724 weeks ago
haha interesting.. never thought about making comments in the history. what's the harm in a simple 'echo' to stdout though?
recursiverse · 723 weeks and 3 days ago
I can grep for '^comment' and get only my comments... I use echo for all sorts of stuff. Also, let's say that I wanted to do something like history | tail -n 5 | sed 's/^comment/#/' > newshell.sh ... can't do that if I'm only using 'echo'...
bartonski · 723 weeks and 2 days ago
Flatcap: # this is a comment won't get written to $HISTFILE. You can see it in your current session, but it doesn't persist after you log out.
bartonski · 723 weeks and 2 days ago
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pugpuppies95 · 34 weeks and 1 day ago

What do you think?

Any thoughts on this command? Does it work on your machine? Can you do the same thing with only 14 characters?

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commandlinefu.com is the place to record those command-line gems that you return to again and again. That way others can gain from your CLI wisdom and you from theirs too. All commands can be commented on, discussed and voted up or down.

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Follow the Tweets.

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.

» http://twitter.com/commandlinefu
» http://twitter.com/commandlinefu3
» http://twitter.com/commandlinefu10

Subscribe to the feeds.

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,…):

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