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commandlinefu.com is the place to record those command-line gems that you return to again and again.

Delete that bloated snippets file you've been using and share your personal repository with the world. 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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May 19, 2015 - A Look At The New Commandlinefu
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Psst. Open beta.

Wow, didn't really expect you to read this far down. The latest iteration of the site is in open beta. It's a gentle open beta-- not in prime-time just yet. It's being hosted over at UpGuard (link) and you are more than welcome to give it a shot. Couple things:

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Your feedback is appreciated via the form on the beta page. Thanks! -Jon & CLFU Team

Redirect STDIN

Terminal - Redirect STDIN
< /path/to/file.txt grep foo
2009-03-29 02:43:40
User: atoponce
Functions: grep
15
Redirect STDIN

Several times, I find myself hitting my up arrow, and changing the search term. Unfortunately, I find myself wasting too much time typing:

grep kernel /var/log/messages

Redirecting STDIN allows me to put the search term at the end so I less cursor movement to change what I'm searching for:

< /var/log/messages grep kernel

If you're using the emacs keyboard binding, then after you press your up arrow, press CTRL+w to erase the word.

If this has already been submitted, I couldn't find it with the search utility.

Alternatives

There are 11 alternatives - vote for the best!

Terminal - Alternatives

Know a better way?

If you can do better, submit your command here.

What others think

very nice. I had not thought of that

Comment by GNUix 391 weeks and 1 day ago

This is very nice. I had always used

cat file|grep foo

for easy editing. Good to know there's a better syntax.

Comment by clockworkavian 391 weeks ago

grep foo

Comment by jnash 391 weeks ago

I wanted to say: grep foo

Comment by jnash 391 weeks ago

Oh well.. looks like theres some garbling of comments.

(here goes)

I wanted to say: grep foo "lessthan"(cat file)

Comment by jnash 391 weeks ago

clockworkavian: using grep with cat like that is highly discouraged, as it (needlessly) invokes cat. I like the suggestion for redirecting stdin.

Comment by kaedenn 391 weeks ago

@kaedenn I know it's discouraged, as grep can do it natively, but for long filenames, having to hit the arrow keys a bunch of times to change a search term is a pain.

I will follow the correct way when it involves less work (the redirection is acceptable), but when it involves more work, I think I'll do it wrong and cut down the RSI

Comment by clockworkavian 390 weeks and 6 days ago

Your point of view

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