Grep in a variable

Posted by Ashfame on Ask Ubuntu See other posts from Ask Ubuntu or by Ashfame
Published on 2011-02-10T14:38:03Z Indexed on 2011/02/10 15:33 UTC
Read the original article Hit count: 265

Filed under:

grep

How to do a grep in a variable? I have stored the wget output in a variable and I need to extract out some strings from it. Like the content of the variable is upgrade http://wordpress.org/download/ http://wordpress.org/wordpress-3.0.5.zip 3.0.5 en_US 4.3 4.1.2

I need to check if the string contains the word upgrade, so I can do a simple grep and then check the exit status of it by $? and proceed. But how can I get the value 3.0.5 which is actually the fourth word? And how to actually grep in a variable?

Related posts about grep

grep is inconsistently defaulting to grep -P?

as seen on Server Fault - Search for 'Server Fault'
I have a script that does some housekeeping that works perfectly well when invoked from an interactive shell, but did nothing when invoked by cron. To troubleshoot this I started a shell with a 'blank' environment with the command: env -i /bin/bash --noprofile --norc Using this blank env I've dug… >>> More
grep pattern interpretted differently in 2 different systems with same grep version

as seen on Server Fault - Search for 'Server Fault'
We manufacture a linux appliance for data centers, and all are running fedora installed from the same kickstart process. There are different hardware versions, some with IDE hard drives and some SCSI, so the filesystems may be at /dev/sdaN or /dev/hdaN. We have a web interface into these appliances… >>> More
grep --exclude/--include syntax (do not grep through certain files)

as seen on Stack Overflow - Search for 'Stack Overflow'
I'm looking for the string "foo=" (without quotes) in text files in a directory tree. It's on a common Linux machine, I have bash shell: grep -ircl "foo=" * In the directories are also many binary files which match "foo=". As these results are not relevant and slow down the search, I want grep… >>> More
Grep failing with Emacs (windows), and GnuWin32 Grep

as seen on Stack Overflow - Search for 'Stack Overflow'
Hi, I've downloaded and installed the GnuWin32 tools, and added the grep executables to the Emacs bin. I've also, for what its worth, added the GnuWin32 bin folder to my Path variable. Problem is though, when I try and run with suggested grep commands, I always get: Grep exited abnormally with… >>> More
How to grep a line start with "*" using grep

as seen on Super User - Search for 'Super User'
Hi, How can I use 'grep' to get lines start with '* ' in my file? I tried grep "" myfile I tried grep " " myfile but returns all the lines of my file. Thank you. >>> More

Developer IT