Visit Our UNIX and Linux User Community


How do i tell my bash shell script to test the output of a command against something


 
Thread Tools Search this Thread
Top Forums UNIX for Dummies Questions & Answers How do i tell my bash shell script to test the output of a command against something
# 1  
Old 10-23-2009
How do i tell my bash shell script to test the output of a command against something

How do i tell my bash shell script to test the output of the command i'm using?? I want this script to look for lines not equal to 1 then let me know..

Code:
$ cat blah ; echo ---- ; cat blah.sh
1 fe
1 fi
1 fo
0 fum
1 blahda
1 blah
0 blahh
1 bla
1 bl
1 blahhh 
----
#!/bin/bash 

while read LINE 
do
echo $LINE | grep 1 | cut -c 1
  if [ ??? -eq 1 ]; then
        echo > /dev/null  
  else
        echo "line is not 1"
fi
done<blah
$

# 2  
Old 10-23-2009
to do it your way, just put the result of your 'echo' line in a variable:
Code:
VAR=`echo $LINE | grep 1 | cut -c 1`
if [ $VAR -eq 1 ]

but depending on your requirement, it might be quicker to do this, which will return all the lines in 'blah' that don't contain '1':
Code:
grep -v 1 blah

 

Previous Thread | Next Thread
Test Your Knowledge in Computers #55
Difficulty: Easy
The term UPS stands for 'Universal Power Source'.
True or False?

10 More Discussions You Might Find Interesting

1. Shell Programming and Scripting

Shell script to replace output of command

Hi I would like to write a shell script which replace particular text in output of a shell command. For example : If I execute pwd (if dir is /users/master/) it should display as - /users/Master_directory/. Also, for generalising the script I would like to receive parameters when I run the... (3 Replies)
Discussion started by: ratneshnagori
3 Replies

2. Shell Programming and Scripting

Addition to Bash shell script that emails final output as attachement?

Greetings. I have a nice bash shell script that runs a multi-step analysis well. I already have the SGE options set up to email me the progress of the run (started, completed, aborted), but a final step would be to code the shell script to email the final output (a .txt file) to the same email... (6 Replies)
Discussion started by: Twinklefingers
6 Replies

3. Shell Programming and Scripting

In bash script, how to assign output of a command to a variable while keeping tabs?

Hi, wondering if it's been asked before but didn't find matches from google. Basically I have this line: myvar=$(echo -e "a\tb") Now somehow the '\t' from the echo output gets replaced with white space and then stored in $myvar. It creates a problem for me later to use tab as delimiter to do... (2 Replies)
Discussion started by: birddie
2 Replies

4. Shell Programming and Scripting

shell script to format command output

Hello team, I am running below command which is giving following output. bash-3.00$ ps -eo pid,pcpu,args | sort +1n | grep -i java 12 0.0 grep -i java 8804 0.0 /opt/app/ccr/home/ccr/WebSphere/AppServer/java/bin/sparcv9/java -XX:+UnlockDiag 9241 0.0... (7 Replies)
Discussion started by: coolguyamy
7 Replies

5. Shell Programming and Scripting

Piping output from a command into bash script

Hi all. I am using procmail to deliver an email to a script I am developing. Procmail delivers the email to the script on standard input. I imagine this is the same as piping input from a command into the script. Hence I've been testing my script by running echo 'test' | sms-autosend-backup.sh ... (2 Replies)
Discussion started by: akindo
2 Replies

6. Shell Programming and Scripting

Need help with shell script - output of top command

I have written shell script to send file as an attachemt of email and output of "top -o res" command as email body. it works fine if i execute manually from prompt but it does not send "top -o res" command output in email body when it is executed via crontab. Any suggestions. My script is below:... (5 Replies)
Discussion started by: needyourhelp10
5 Replies

7. Shell Programming and Scripting

how to direct scp output to a file in bash shell or script

I can run this from the command line: scp -i identfile /path/file_to_send remotelogin@remotebox:/path_to_put_it/file_to_send and I get: file_to_send 100% |***************************************************************************| 0 00:00 but if I do: scp -i identfile... (6 Replies)
Discussion started by: NewSolarisAdmin
6 Replies

8. Shell Programming and Scripting

Evaluating command output (shell script )

Hello, in a script i would like to evaluate a command output with a grep, for example, to know if the parameter defined by the user is in the output. Something like: the_command | grep $1 Please, how is the way to evalulate in this a script, like if echo "incorrect parameter, not in... (2 Replies)
Discussion started by: aristegui
2 Replies

9. Shell Programming and Scripting

reading command output from shell script

Hi List, How to read the output of a command executed from a script. For ex. sample_scritp.sh ------------- useradd testuser1 password testuser1 .... ..... -------------- This prompts for "password", and "confirm password", for which i need to give the values from script. Can... (4 Replies)
Discussion started by: sri b
4 Replies

10. Shell Programming and Scripting

Capturing shell script command output

I am trying to check to see if a file exists on a ftp server, well, I know that cant be done, atleast directly, So I came up with this small script ftp -n $HOST <<END_SCRIPT quote USER $USER quote PASS $PASSWD cd public_html/crap dir $FILE quit END_SCRIPT Where the $ variable... (2 Replies)
Discussion started by: designflaw
2 Replies

Featured Tech Videos