Login or Register to Ask a Question and Join Our Community

Sponsored Content
Full Discussion: single output of awk script processing multiple files
Top Forums UNIX for Dummies Questions & Answers single output of awk script processing multiple files Post 302342352 by Scott on Sunday 9th of August 2009 04:41:26 AM
Old 08-09-2009
It changes output_file from an awk variable into a string.

If you don't use the quotes, depending on your awk version either no output file will be written, or you'll get an error. If you declare an awk variable called output_file, then it would be fine:

Code:
/root/tmp # echo x | awk '{print > output_file}'
awk: (FILENAME=- FNR=1) fatal: expression for `>' redirection has null string value
/root/tmp # cat output_file
cat: output_file: cannot open [No such file or directory]

Code:
/root/tmp # echo x | awk '{print > "output_file"}'
/root/tmp # cat output_file 
x

Code:
/root/tmp # echo y | awk '{output_file="output_file"; print > output_file}'  
/root/tmp # cat output_file 
y

 

10 More Discussions You Might Find Interesting

1. Shell Programming and Scripting

Help needed in processing multiple variables in a single sed command.

Is it possible to process multiple variables in a single sed command? I have the following ksh with three variables and I want to search for all variables which start with "var" inside input.txt. I tired "$var$" but it just prints out everyting in input.txt and does not work. $ more test.ksh... (5 Replies)
Discussion started by: stevefox
5 Replies

2. Shell Programming and Scripting

awk, perl Script for processing a single line text file

I need a script to process a huge single line text file: The sample of the text is: "forward_inline_item": "Inline", "options_region_Australia": "Australia", "server_event_err_msg": "There was an error attempting to save", "Token": "Yes", "family": "Family","pwd_login_tab": "Enter Your... (1 Reply)
Discussion started by: hmsadiq
1 Replies

3. Shell Programming and Scripting

Writing output into different files while processing file using AWK

Hi, I am trying to do the following using AWK program. 1. Read the input data file 2. Parse the record and see if it contains errors 3. If the record contains errors, then write it into Reject file, else, write into usual output file or display it on the screen Here is what I have done -... (6 Replies)
Discussion started by: vidyak
6 Replies

4. 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

5. UNIX for Dummies Questions & Answers

Using AWK: Extract data from multiple files and output to multiple new files

Hi, I'd like to process multiple files. For example: file1.txt file2.txt file3.txt Each file contains several lines of data. I want to extract a piece of data and output it to a new file. file1.txt ----> newfile1.txt file2.txt ----> newfile2.txt file3.txt ----> newfile3.txt Here is... (3 Replies)
Discussion started by: Liverpaul09
3 Replies

6. Shell Programming and Scripting

awk, multiple files input and multiple files output

Hi! I'm new in awk and I need some help. I have a folder with a lot of files and I need that awk do something in each file and print a new file with the output. The input file name should be modified when I print the outpu files. Thanks in advance for help! :-) ciao (5 Replies)
Discussion started by: gabrysfe
5 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. Shell Programming and Scripting

Combining columns from multiple files into one single output file

Hi, I have 3 files with one column value as shown File: a.txt ------------ Data_a1 Data_a2 File2: b.txt ------------ Data_b1 Data_b2 Data_b3 Data_b4 File3: c.txt ------------ Data_c1 Data_c2 Data_c3 Data_c4 Data_c5 (6 Replies)
Discussion started by: vfrg
6 Replies

9. Shell Programming and Scripting

Using a single "find" cmd to search for multiple file types and output individual files

Hi All, I am new here but I have a scripting question that I can't seem to figure out with the "find" cmd. What I am trying to do is to only have to run a single find cmd parsing the directories and output the different file types to induvidual files and I have been running into problems.... (3 Replies)
Discussion started by: swaters
3 Replies

10. Shell Programming and Scripting

Passing multiple files to awk for processing in bash script

Hi, I'm using awk command in bash script. I'm able to pass multiple files to awk for processing.The code i can use is as below(sample code) #!/bin/bash awk -F "," 'BEGIN { ... ... ... }' file1 file2 file3 In the above code i'm passing the file names manually and it is fine till my... (7 Replies)
Discussion started by: shree11
7 Replies

LEARN ABOUT NETBSD

time

TIME(3) 						   BSD Library Functions Manual 						   TIME(3)

NAME

     time -- get time of day

LIBRARY

     Standard C Library (libc, -lc)

SYNOPSIS

     #include <time.h>

     time_t
     time(time_t *tloc);

DESCRIPTION

     The time() function returns the value of time in seconds since 0 hours, 0 minutes, 0 seconds, January 1, 1970, Coordinated Universal Time.

     A copy of the time value may be saved to the area indicated by the pointer tloc.  If tloc is a NULL pointer, no value is stored.

     Upon successful completion, time() returns the value of time.  Otherwise a value of ((time_t) -1) is returned and the global variable errno
     is set to indicate the error.

ERRORS

     No errors are defined.

SEE ALSO

     gettimeofday(2), ctime(3)

STANDARDS

     The time() function conforms to ISO/IEC 9945-1:1990 (``POSIX.1'').

HISTORY

     A time() function appeared in Version 2 AT&T UNIX.  It returned a 32-bit value measuring sixtieths of a second, leading to rollover every
     2.26 years.  In Version 6 AT&T UNIX, the precision of time() was changed to seconds, allowing 135.6 years between rollovers.

     In NetBSD 6.0 the time_t type was changed to be 64 bits wide, including on 32-bit machines, making rollover a concern for the far distant
     future only.  Note however that any code making the incorrect assumption that time_t is the same as long will fail on 32-bit machines in
     2038.

BSD
								 November 5, 2011							       BSD
All times are GMT -4. The time now is 08:28 PM.
Unix & Linux Forums Content Copyright 1993-2022. All Rights Reserved.
Privacy Policy