Sponsored Content
Top Forums Shell Programming and Scripting Passing multiple files to awk for processing in bash script Post 302905575 by Scrutinizer on Thursday 12th of June 2014 08:02:03 AM
Old 06-12-2014
If you have many files and ARG_MAX is exceeded (You'll see a message like: awk: arg list too long) , then it depends on the script if xargs can be used, though. xargs may need to call the awk script multiple times depending on the number of files, so the outcome will be wrong if for example your script is calculating a grand total number, for which it needs the content of all those files.

Of course using cat * to concatenate the files and feeding that output into awk's stdin brings no solace either, since cat has the same restrictions.

But these restrictions could be circumvented with a construct like this:

Code:
for i in *
do
  cat "$i"
done |
awk -F "," 'BEGIN { 
...
...
...
}'


Last edited by Scrutinizer; 06-12-2014 at 09:14 AM..
This User Gave Thanks to Scrutinizer For This Post:
 

10 More Discussions You Might Find Interesting

1. Shell Programming and Scripting

How to write bash script to explode multiple zip files

I have a directory full of zip files. How would I write a bash script to enumerate all the zip files, remove the ".zip" from the file name, create a directory by that name and unzip each zip file into its corresponding directory? Thanks! Siegfried (3 Replies)
Discussion started by: siegfried
3 Replies

2. UNIX for Dummies Questions & Answers

single output of awk script processing multiple files

Helllo UNIX Forum :) Since I am posting on this board, yes, I am new to UNIX! I read a copy of "UNIX made easy" from 1990, which felt like a making a "computer-science time jump" backwards ;) So, basically I have some sort of understanding what the basic concept is. Problem Description:... (6 Replies)
Discussion started by: Kasimir
6 Replies

3. Shell Programming and Scripting

awk script processing data from 2 files

Hi! I have 2 files containing data that I need to process at the same time, I have problems in reading a different number of lines from the different files. Here is an explanation of what I need to do (possibly with an awk script). File "samples.txt" contains data in the format: time_instant... (6 Replies)
Discussion started by: Alice236
6 Replies

4. Shell Programming and Scripting

bash script to compile multiple .c files with some options

I'm trying to write a bash script and call it "compile" such that running it allows me to compile multiple files with the options "-help," "-backup," and "-clean". I've got the code for the options written, i just can't figure out how to read the input string and then translate that into option... (5 Replies)
Discussion started by: travis.batzer
5 Replies

5. Shell Programming and Scripting

Bash script to copy timestamps of multiple files

Hi, I have a bunch of media files in a directory that have been converted (from MTS to MOV format), so my directory contains something like this: clip1.mts clip1.mov clip2.mts clip2.mov The problem is that the .mov files that have been created have the timestamps of the conversion task,... (2 Replies)
Discussion started by: Krakus
2 Replies

6. Shell Programming and Scripting

Passing multiple files to awk

Hi all, I have a load of files in the format e.g. a_1.out a_300.out a_20.out etc I would like to numeric sort them in ascending order by the number in the file name, then pass them into awk for manipulation. How do I do this? (8 Replies)
Discussion started by: jimjam
8 Replies

7. Shell Programming and Scripting

Processing multiple files awk

hai i need my single awk script to act on 4 trace files of ns2 and to calculate througput and it should print result from each trace file in a single trace file. i tried with the following code but it doesnt work awk -f awkscript inputfile1 inputfile2 inputfile3 inputfile4>outputfile ... (4 Replies)
Discussion started by: sarathyy
4 Replies

8. Programming

awk processing / Shell Script Processing to remove columns text file

Hello, I extracted a list of files in a directory with the command ls . However this is not my computer, so the ls functionality has been revamped so that it gives the filesizes in front like this : This is the output of ls command : I stored the output in a file filelist 1.1M... (5 Replies)
Discussion started by: ajayram
5 Replies

9. Shell Programming and Scripting

Plink (processing multiple commands) using Bash

I'm completely brand new to bash scripting (migrating from Windows batch file scripting). I'm currently trying to write a bash script that will automatically reset "error-disabled" Cisco switch ports. Please forgive the very crude and inefficient script I have so far (shown below). It is... (10 Replies)
Discussion started by: MKANET
10 Replies

10. Shell Programming and Scripting

Loop through multiple files in bash script

Hi Everybody, I'm a newbie to shell scripting, and I'd appreciate some help. I have a bunch of .txt files that have some unwanted content. I want to remove lines 1-3 and 1028-1098. #!/bin/bash for '*.txt' in <path to folder> do sed '1,3 d' "$f"; sed '1028,1098 d' "$f"; done I... (2 Replies)
Discussion started by: BabyNuke
2 Replies
cat(1)							      General Commands Manual							    cat(1)

Name
       cat - concatenate and print data

Syntax
       cat [ -b ] [ -e ] [ -n ] [ -s ] [ -t ] [ -u ] [ -v ] file...

Description
       The  command reads each file in sequence and displays it on the standard output.  Therefore, to display the file on the standard output you
       type:
       cat file
       To concatenate two files and place the result on the third you type:
       cat file1 file2 > file3
       To concatenate two files and append them to a third you type:
       cat file1 file2 >> file3
       If no input file is given, or if a minus sign (-) is encountered as an argument, reads from the standard input file.  Output is buffered in
       1024-byte blocks unless the standard output is a terminal, in which case it is line buffered.  The utility supports the processing of 8-bit
       characters.

Options
       -b   Ignores blank lines and precedes each output line with its line number.

       -e   Displays a dollar sign ($) at the end of each output line.

       -n   Precedes all output lines (including blank lines) with line numbers.

       -s   Squeezes adjacent blank lines from output and single spaces output.

       -t   Displays non-printing characters (including tabs) in output.  In addition to those representations used with the -v  option,  all  tab
	    characters are displayed as ^I.

       -u   Unbuffers output.

       -v   Displays  non-printing  characters (excluding tabs and newline) as the ^x.	If the character is in the range octal 0177 to octal 0241,
	    it is displayed as M-x. The delete character (octal 0177) displays as ^?.  For example, is displayed as ^X.

See Also
       cp(1), ex(1), more(1), pr(1), tail(1)

																	    cat(1)
All times are GMT -4. The time now is 06:29 PM.
Unix & Linux Forums Content Copyright 1993-2022. All Rights Reserved.
Privacy Policy