How to configure 'grep' to ignore 'No such file or directory

n179911 · 07-07-2009, 06:56 PM

Hi,

When I try 'grep' like this 'grep -r Test .', I get a lot of errors 'No such file or directory'.

Example:
grep: ./frameworks/opt/com.google.android/.git/packed-refs: No such file or directory
grep: ./frameworks/opt/com.google.android/.git/rr-cache: No such file or directory
grep: ./frameworks/opt/com.google.android/.git/svn: No such file or directory

Can you please tell me how can I configure grep to ignore those errors?

Thank you.

Robhogg · 07-07-2009, 07:22 PM

The simplest way is probably to throw the errors away. They'll be output to stderr, and you can simply redirect this to /dev/null (a.k.a "the bit bucket"):

Code:

grep -r Test . 2>/dev/null # stderr has "file descriptor" 2

karamarisan · 07-07-2009, 08:28 PM

grep has a -s option to deal with this, as well.

jeromeNP7 · 07-08-2009, 03:57 AM

Shouldn't that be '&2>/dev/null' instead of '2>/dev/null'? So far I've always seen this with the ampersand sign in front of it ...

Linux

colucix · 07-08-2009, 04:14 AM

Quote:

Originally Posted by jeromeNP7

Shouldn't that be '&2>/dev/null' instead of '2>/dev/null'? So far I've always seen this with the ampersand sign in front of it ...

&> means "redirect both standard output and standard error", but if you want to redirect only standard error you have to use 2>. More details in the Advanced Bash Scripting Guide, here.