xargs: String concatenation

grep xargs
User picture User · Jun 20, 2012 · Viewed 17k times · Source 
zgrep -i XXX XXX | grep -o "RID=[0-9|A-Z]*" |
   uniq | cut -d "=" -f2 |
   xargs -0 -I string echo "RequestID="string

My output is 

RequestID=121212112
8127127128
8129129812

But my requirement is to have the request ID prefixed before all the output. Any help is appreciated

Answer

Lev Levitsky picture Lev Levitsky · Jun 20, 2012

Try -n option of xargs.

-n max-args

Use at most max-args arguments per command line. Fewer than max-args arguments will be used if the size (see the -s option) is exceeded, unless the -x option is given, in which case xargs will exit.

Example:

$ echo -e '1\n2' | xargs echo 'str ='
str = 1 2

$ echo -e '1\n2' | xargs -n 1 echo 'str ='
str = 1
str = 2

Related questions

Using grep to search for hex strings in a file

I have been trying all day to get this to work. Does anyone know how to get grep, or something of the like, to retrieve offsets of hex strings in a file? I have a bunch of hexdumps that I …

Read More
Tarballing without Git metadata

My source tree contains several directories which are using Git source control, and I need to tarball the whole tree excluding any references to the Git metadata or custom log files. I thought I'd have a go using a combination …

Read More
Is there a grep equivalent for find's -print0 and xargs's -0 switches?

I often want to write commands like this (in zsh, if it's relevant): find <somebasedirectory> | \ grep stringinfilenamesIwant | \ grep -v stringinfilesnamesIdont | \ xargs dosomecommand (or more complex combinations of greps) In recent years find has added the -print0 switch, and …

Read More