Kwatog & Co » Linux

Suppress Error Message of cp (copy)

admin — Fri, 04 May 2012 07:34:43 +0000

There are times when you don’t need to know if the command you fired threw an error or not. That’s exactly what I needed in one of the systems I maintain. The copy command should not throw an error if there’s no file to copy. So instead of writing a number of lines for validations, I just throw the message to /dev/null. Here’s the code :

cp /path/to/file.txt /newpath/ 2> /dev/null

Source : existing codes

Recursive setacl command on Linux/Unix

admin — Fri, 24 Jun 2011 09:45:35 +0000

Setting access control list(acl) recursively is not as straigthforward in HP/UX. I believe the same is true for other Unix flavors. In case you are wondering how, the command is shown below.

find /any/path -exec setacl -m user:USERID:rwx {} ';'

What it does is it finds all the files and directories inside the /any/path, recursively. And then on each of the files/directories, it executes the the setacl command.

For some linux flavors, this is done simpler as below.
setacl -Rm user:USERID:rwx

Here’s how to install setacl/setfacl –>Install setacl

Change Ownership of File/Folder (chown)

admin — Tue, 18 Aug 2009 17:25:36 +0000

chown kwatog /usr/kwatog

Linux Search and Replace in File

admin — Wed, 12 Aug 2009 05:16:32 +0000

Here’s the syntax

sed 's/SEARCH_TEXT/REPLACE_TEXT/g' FILENAME > OUTFILE
SEARCH_TEXT is the text to search in filename
REPLACE TEXT is the string to be put in place of SEARCH_TEXT
FILENAME is the file to be searched
OUTFILE is the file where the output

Sample
sed 's/ORDER/VANTIVE_ORDER/g' kwatogtest.sql > kwatogsed.log

I keep on forgetting that syntax although it’s so simple. There might other ways of doing it but as of now, it’s the only way I know. :p