Commands by jrparris (1)

  • Disaster Snapshot (procmail)

    Required: 1) Systems that send out alert emails when errors, database locks, etc occur. 2) a system that: a) has the ability to receive emails, and has procmail installed. b) has ssh keys set up to machines that would send out alerts. When procmail receives alert email, you can issue a command like this one (greps and awks may very - you're isolating the remote hostname that had the issue). This will pull process trees from the alerting machines, which is always useful in later analysis. Show Sample Output


    0
    for x in `grep server /tmp/error.log | awk '{print $3}'`; do \ t=`date "+%d-%m-%H%M%S"` ; ssh -q -t admin@$x.domain.com 'pstree -auln' > ~/snapshots/$x-$t.out \ done
    jrparris · 2010-02-26 19:50:41 5

What's this?

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.

Share Your Commands

Check These Out

check open ports without netstat or lsof

Geolocate a given IP address
Defines a function to geolocate a given IP address; if none supplied, will default to your external IP address.

list files recursively by size

python - covert image to base64 string for data URI use
useful if you are using lots of data URI's in your css files

Better recursive grep with pretty colors... requires ruby and gems (run: "gem install rak")

Find usb device in realtime
Using this command you can track a moment when usb device was attached.

finding more large files

remove recursively all txt files with number of lines less than 10

Copy ssh keys to user@host to enable password-less ssh logins.
To generate the keys use the command ssh-keygen

Enter parameter if empty (script becomes interactive when parameters are missing)
Can be used for command line parameters too. If you have a more complicated way of entering values (validation, GUI, ...), then write a function i.e. EnterValue() that echoes the value and then you can write: $ param=${param:-$(EnterValue)}

Stay in the loop…

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,…):

Subscribe to the feed for: