Multiple file input


 
Thread Tools Search this Thread
Top Forums Shell Programming and Scripting Multiple file input
# 8  
Old 01-15-2014
I just what to use the same file multiple times and write it once.

Example.
Code:
awk 'code' file file file file

This awk reads file 4 times and do some with the data.
I would like
Code:
awk 'code' 4xfile

Write name of file just once, and tell it should be done four times.
# 9  
Old 01-15-2014
You may try something like this

Code:
$ cat test
1
2
3
4
5
6
7

Code:
$ awk 'FNR==NR{print $0;next}{print "yes"$0}' $(seq -s "test " 3 | tr -d '[:digit:]')
1
2
3
4
5
6
7
yes1
yes2
yes3
yes4
yes5
yes6
yes7

Code:
$ awk 'FNR==NR{print $0;next}{print "yes"$0}' $(printf 'test %.0s' {1..2})
1
2
3
4
5
6
7
yes1
yes2
yes3
yes4
yes5
yes6
yes7

# 10  
Old 01-15-2014
Quote:
Originally Posted by Jotne
I just what to use the same file multiple times and write it once.
Ah. Well, awk doesn't work that way, you'll just have to write a loop.

Code:
FILENAME="a"
LOOPS=4
while [ $loops -gt 0 ]
do
        FILES="$FILES $FILENAME"
        let LOOPS=LOOPS-1
done

awk '{...}' $FILES

# 11  
Old 01-15-2014
Ok. I have seen it used, so I have to search.
# 12  
Old 01-15-2014
Quote:
Originally Posted by Jotne
Ok. I have seen it used, so I have to search.
Seen what used? awk really doesn't work that way...

You may have seen an obscure feature of some specific shell, to repeat a string a certain number of times.
# 13  
Old 01-15-2014
Found it after reading some hundreds of post {,}:
Code:
awk 'FNR==NR {a[$1]++;next} ($2 in a) {print $2}' file file

is the same as
Code:
awk 'FNR==NR {a[$1]++;next} ($2 in a) {print $2}' file{,}


Code:
awk 'code' file file file file

is the same as
Code:
awk 'code' file{,,,}

Is this obscure?
# 14  
Old 01-15-2014
It's not an awk feature, try this:

Code:
$ echo file{,,,}
file file file file

$

Yes, it's pretty obscure, and doesn't work in all Bourne shells. Unfortunately it isn't what you asked for either, you wanted to give it a number.
Login or Register to Ask a Question

Previous Thread | Next Thread

10 More Discussions You Might Find Interesting

1. Shell Programming and Scripting

Removing multiple lines from input file, if multiple lines match a pattern.

GM, I have an issue at work, which requires a simple solution. But, after multiple attempts, I have not been able to hit on the code needed. I am assuming that sed, awk or even perl could do what I need. I have an application that adds extra blank page feeds, for multiple reports, when... (7 Replies)
Discussion started by: jxfish2
7 Replies

2. Shell Programming and Scripting

Avoid overwriting backup file when multiple entries need to replace in one file input from another

Hello, I have been working on script in which search and replace the multiple pattern. 1. update_params.sh read the multiple pattern from input file ParamMapping.txt(old_entry|New_entry) and passing this values one by one to change_text.sh 2. change_text.sh read... (0 Replies)
Discussion started by: ketanraut
0 Replies

3. Shell Programming and Scripting

Copying a file to multiple other files using a text file as input

Hello, I have a file called COMPLIST as follows that contains 4 digit numbers.0002 0003 0010 0013 0015 0016 0022 0023 0024 0025 0027 0030 0031 0032 0033 0035 0038 0041 (3 Replies)
Discussion started by: sph90457
3 Replies

4. Shell Programming and Scripting

How to ftp multiple files by taking the file name from a input file.

Hi, I'm working on a script which has to copy multiple files from one server to another server. The list of files that are to be copied is present in a file say input.txt. vi input.txt abc.c welcome.c new.c welcome1.c for ftp'ing a single file say 'new.c' the following code... (2 Replies)
Discussion started by: i.srini89
2 Replies

5. Shell Programming and Scripting

Split a file into multiple files based on the input pattern

I have a file with lines something like. ...... 123_start ...... ....... 123_end .... ..... 456_start ...... ..... 456_end .... ..... 789_start .... .... 789_end (6 Replies)
Discussion started by: abinash
6 Replies

6. Shell Programming and Scripting

Create Multiple files by reading a input file and changing the contents

Being new to this area .I have been assigned a task which i am unable to do . Can any one please help me . Hi I have requirement where i have input file XYZ_111_999_YYYYMMDD_1.TXT and with header and series of Numbers and Footer. I want to create a mutiple output files with each file having a... (2 Replies)
Discussion started by: bhargavkr
2 Replies

7. Shell Programming and Scripting

building output file from multiple input files

Hi there, I am trying to figure out a way to combine multiple sources with different data on a single file, and I am trying to find the best way to do it. I have multiple files, let's say A, B, C and D. A has a field in common with B, B has a field in common with C, and C has a field in... (2 Replies)
Discussion started by: ppucci
2 Replies

8. Shell Programming and Scripting

isql input file with multiple sql statements

I've got: isql -U $USERID -S $SERVER -D $DATABASE -i inputfile.sql -o outputfile.txt in inputfile I have: go sql#1 go sql#2 go sql#3 go I also tried without "go" and with";" instead which did not work SQL statements will work if I paste them directly into the script and use EOF ... (0 Replies)
Discussion started by: Cailet
0 Replies

9. Programming

Multiple scanners on same input file using lex/flex

Hi all, I'm working with flex (version 2.5.4a) on GNU/linux. I used it to develop 4 scanner C files for matching different patterns within an input file. But the problem now on my hand is that I need to conditionally combine these. That is in main (placed in a separate C file other than the 4... (5 Replies)
Discussion started by: Rakesh Ranjan
5 Replies

10. Shell Programming and Scripting

Can Xargs execute multiple commands of evry input file

Hello , I am trying to print the footer of evry file in the given directory with xargs command like follows ls -1 | xargs -I {} gzcat {} | tail -1 now problem with this is only last file foooter is getting printed as " | tail -1 " is getting executed for the last file. I know this can... (4 Replies)
Discussion started by: nilesrex
4 Replies
Login or Register to Ask a Question