UNIX GURU UNIVERSE
UNIX HOT TIP
Unix Tip 2320 - May 9, 2006
http://www.ugu.com/sui/ugu/show?tip.today
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OPERATING ON MULTIPLE FILES
Have you ever felt the need to perform a set of operations on multiple files simultaneously???
Here is a solution for that.
For instance, if it is required to perform multiple operations like searching a string (using grep), and executing an awk or perl script etc, etc. on not just one file but a set of files, use the following commands at the unix prompt:
$<: foreach i (<file_list>)
? echo $i
? grep <search_pattern> $i > tmp
? awk -f awk_script tmp >> report
? ....
? ....
? end
$<:
The files list in the brackets can be either
* Specifically mentioned
* A unix variable which contains a list of file names. For instance, the variable "p" can be assigned all the files starting with string "data" as follows:
set p = (data*)
Other examples are:
set g = `grep -l "Startpoint" * `
or
set all = *
(This assigns all file names in the current directory to the variable "all" )
And its usage with the "foreach" command will be as follows:
$<: foreach i ($all)
.....
.....
end
This tip generously supported by: lakshmi@virtualipgroup.com
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