Visit Our UNIX and Linux User Community


How to capture system() function output in variable


 
Thread Tools Search this Thread
Top Forums Shell Programming and Scripting How to capture system() function output in variable
# 1  
Old 07-31-2014
How to capture system() function output in variable

How to capture system() function output in awk variable and the print that awk variable.....
# 2  
Old 07-31-2014
A system() function is a shell.
If the order doesn't matter,
it is usually better to first start with a shell, then invoke awk from there and pass arguments. Example:
Code:
#!/bin/sh
x=$(whatever command)
awk -v x="$x" 'awk code can use the x variable'

# 3  
Old 07-31-2014
Thanks
Yeah I agree with you...but I want to know how to store result of system() function..........
# 4  
Old 07-31-2014
All you can capture into a variable is the exit code of the command executed by the system function, like A=system("ls"). The output of ls is printed to stdout immediately.
# 5  
Old 07-31-2014
Ha soo we cannot capture commands output instead of status.....okay thanks for quick reply

---------- Post updated at 11:34 AM ---------- Previous update was at 11:29 AM ----------

Soo there is no way to capture result? ????SmilieSmilieSmilieSmilie
# 6  
Old 07-31-2014
You can store the output of an external command invoked from inside awk,
but you should not use the system function for that:
Code:
zsh-5.0.2[user]% awk 'BEGIN { "date" | getline dt; print "Got", dt }'
Got Thu, Jul 31, 2014  1:36:47 PM

# 7  
Old 07-31-2014
SmilieSmilieSmilie thanks

Previous Thread | Next Thread
Test Your Knowledge in Computers #749
Difficulty: Medium
The ZX81 had a base configuration of 1 KB of on-board memory that could officially be expanded externally to 64 KB.
True or False?

10 More Discussions You Might Find Interesting

1. Red Hat

Unable to capture value from function

Hi Experts, Am writing a code which need to check for the previous day date and pickup the file as per the previous day date. Problem: Why variable "YDATE" is empty ? O/S: RHEL 5.6 Shell: BASH Desired O/P: ls -lrt /opt/test/user/atsuser.NHU/out/demon.08272017 When I checked the... (3 Replies)
Discussion started by: pradeep84in
3 Replies

2. Homework & Coursework Questions

How to Dynamically Pass Parameter to plsql Function & Capture its Output Value in a Shell Variable?

Use and complete the template provided. The entire template must be completed. If you don't, your post may be deleted! 1. The problem statement, all variables and given/known data: 2. Relevant commands, code, scripts, algorithms: #! /bin/ksh v="ORG_ID" ... (2 Replies)
Discussion started by: sujitdas2104
2 Replies

3. UNIX for Dummies Questions & Answers

Capture Multiple Lines Into Variable As Of Standard Output

Hello All, I have the below script and output. cat test.sh #!/bin/bash -x logit() { echo " - ${*}" > ${LOG_FILE} } LOG_FILE=/home/infrmtca/bin/findtest.log VAR=`find . -type f -name "*sql"` logit $VAR Output: cat /home/infrmtca/bin/findtest.log -... (9 Replies)
Discussion started by: Ariean
9 Replies

4. Shell Programming and Scripting

System Output in to an Array or variable

hey guys in only new to scripting as such, but i have a problem. i want to take the output of a search i do in the command line to then be in a variable but only a certain part of the output. this this what im doing: -bash-2.05b$ ldapsearch -x '(dn:=dc)' dc|grep dc= # base... (1 Reply)
Discussion started by: jmorey
1 Replies

5. Programming

capture the output of printf into another variable

Hi , I wonder if in java I can pipe the below output of the printf into a variable: System.out.printf(" This is a test %s\n", myVariable); I want to keep the output of the printf command to create my history array. Thanks. (2 Replies)
Discussion started by: arizah
2 Replies

6. Shell Programming and Scripting

unix capture oracle function error

Hi, I want to execute an oracle function from unix script so for that I created a sample oracle function as below: create or replace function test_fn(test_date out varchar2) RETURN varchar2 IS BEGIN select to_char(sysdate,'DD-MON-YY') into test_date from dual; return test_date;... (5 Replies)
Discussion started by: dips_ag
5 Replies

7. Programming

[C language] system function print output when not expected.

Hi, I am new to C and have a little problem. I am not planning to be a C expert, but this would be nice to understand. The problem is that a 'system' call prints it output to stdout, when I do not expect this. This is the program: trial.c #include <ctype.h> #include <unistd.h>... (5 Replies)
Discussion started by: ejdv
5 Replies

8. Shell Programming and Scripting

how to capture oracle function returning 2 values in unix

i have an oracle function which returns two values, one is the error message if the function encounters anything and another one which returns a number i need to capture both and pass it on to unix shell script how to do it (2 Replies)
Discussion started by: trichyselva
2 Replies

9. Shell Programming and Scripting

Passing global variable to a function which is called by another function

Hi , I have three funcions f1, f2 and f3 . f1 calls f2 and f2 calls f3 . I have a global variable "period" which i want to pass to f3 . Can i pass the variable directly in the definition of f3 ? Pls help . sars (4 Replies)
Discussion started by: sars
4 Replies

10. Shell Programming and Scripting

[csh] How to capture output from a command and pass it on to a variable?

Hi there! I'm trying to write a script that will capture output from a command and assign it to a variable. Let's say, for example, I'd like to catch from inside the script whatever the following command outputs: ls *.aaa and put it into a variable "listoffiles". What I tried was: set... (3 Replies)
Discussion started by: machinogodzilla
3 Replies

Featured Tech Videos