Login or Register to Ask a Question and Join Our Community


UNIX for Dummies Questions & Answers

Run multiple commands

 
Thread Tools Search this Thread
Top Forums UNIX for Dummies Questions & Answers Run multiple commands
# 1  
Old 03-20-2012
Run multiple commands
Hi All,

Is it possible to run second/multiple commands at a time in script before the completion/return of first command?

Pls reply.
# 2  
Old 03-20-2012
You can run comands in the background using the & symbol. The wait command waits for these processes to finish..
Code:
cmd1 &
cmd2 &
cmd3
wait
cmd4

In this example "wait" waits for cmd's 1 and 2 to finish and it is invoked when the foreground process cmd3 finishes. After cmd1 and cmd2 will have finished cmd4 gets run.
Last edited by Scrutinizer; 03-20-2012 at 09:13 AM..
# 3  
Old 03-21-2012
Hi Thanks for you reply. How can I store the return code of cmd 1,2& 3 before the start of cmd 4? Please help!!
# 4  
Old 03-21-2012
You can call $status after each command.

Code:
echo $status

For example, using
Quote:
man grep
the comment on the exit status is as follows:
Code:
EXIT STATUS
       Normally, the exit status is 0 if selected lines are found and 1 otherwise.  But the exit status is 2 if an error  occurred,  unless  the  -q  or  --quiet  or
       --silent option is used and a selected line is found.  Note, however, that POSIX only mandates, for programs such as grep, cmp, and diff, that the exit status
       in case of error be greater than 1; it is therefore advisable, for the sake of portability, to use logic that tests for  this  general  condition  instead  of
       strict equality with 2.

# 5  
Old 03-21-2012
Hi, you can record the process id of background jobs 1 and 2 with $! and then collect their return codes through through the jobs command. The return code of foreground jobs 3 and 4 can be found in $?
# 6  
Old 03-28-2012
Thanks all!
 
Login or Register to Ask a Question

Previous Thread | Next Thread

10 More Discussions You Might Find Interesting

1. UNIX for Advanced & Expert Users

Pass Multiple Commands and Open Multiple Xterms via PSS

Hello, I'm attempting to open multiple xterms and run a command as an SAP user via sudo using PSSH. So far, I'm able to run PSSH to a file of servers with no check for keys, open every xterm in to the servers in the file list, and SUDO to the SAP(ADM) user, but it won't do anything else... (11 Replies)
Discussion started by: icemanj
11 Replies

2. Shell Programming and Scripting

Run multiple commands in ssh

Hi All, I have the below requirement. I want to copy the local file to remote after that i need to run the local script on a remote machine.When i use two ssh commnds i can achieve this. But i want to achieve this using one ssh command. Below command to copy the local file to remote ssh -q... (2 Replies)
Discussion started by: mohanalakshmi
2 Replies

3. Shell Programming and Scripting

[Solved] Run multiple commands in invoked program

Hi, I have coded a program in Haskell using the compiler Hugs and the program requires multiple commands (with parameters) to be entered into it, it then outputs the result of its execution. I need to test a lot of different options (i.e. the parameters) so it would be obvious to automate the... (0 Replies)
Discussion started by: tz742
0 Replies

4. SuSE

Allow multiple users to run several root commands

I am using SUSE Linux Enterprise Server 10 SP2 (i586) and I had earlier ammended my sudoers file to allow users to become root user with "sudo su - " command Now I am trying to add multiple users to the sudoers file to run several commands such as restarting the server, restarting the nagios... (9 Replies)
Discussion started by: hedkandi
9 Replies

5. Shell Programming and Scripting

perform 3 awk commands to multiple files in multiple directories

Hi, I have a directory /home/datasets/ which contains a bunch (720) of subdirectories called hour_1/ hour_2/ etc..etc.. in each of these there is a single text file called (hour_1.txt in hour_1/ , hour_2.txt for hour_2/ etc..etc..) and i would like to do some text processing in them. Each of... (20 Replies)
Discussion started by: amarn
20 Replies

6. UNIX for Dummies Questions & Answers

How to run multiple piped commands in a find -exec statement?

I can't get this to work. Running a single command works fine: find . -name "*.dat" -exec wc -l '{}' \; gives me the file name and number of lines in each .dat file in the directory. But what if I want to pipe commands, e.g. to grep something and get the number of lines with that pattern... (3 Replies)
Discussion started by: DJR
3 Replies

7. Solaris

Help with executing multiple remote commands after multiple hops

Hi SSHers, I have embedded this below code in my shell script.. /usr/bin/ssh -t $USER@$SERVER1 /usr/bin/ssh $USER2@S$SERVER2 echo uptime:`/opt/OV/bin/snmpget -r 0 -t 60 $nodeName system.3.0 | cut -d: -f3-5` SSH to both these servers are public-key authenticated, so things run... (13 Replies)
Discussion started by: LinuxUser2008
13 Replies

8. Shell Programming and Scripting

Run multiple commands in $() without opening a new shell

The code below works, but takes too many lines and looks awkward: db2 "export to $filename of del select * from $table with ur"|tee -a $LOGFILE|awk '/Number of rows exported:/ {print $5}' > numrows.tmp numrows=$(cat numrows.tmp) rm numrows.tmp When I try the... (2 Replies)
Discussion started by: akar_naveen
2 Replies

9. Shell Programming and Scripting

Run a shell script from one host which connext to remote host and run the commands

I want to write a script which would run from one host say A and connect to other remote host B and then run rest of commands in that host. I tried connecting from A host to B with SSH but after connecting to host B it just getting me inside Host B command prompt. Rest of the script is not running... (6 Replies)
Discussion started by: SN2009
6 Replies

10. UNIX for Dummies Questions & Answers

Command to run multiple commands from a file.

I need a command, which could run mutliple commands from a file. Let's say, I have mv fileA1 fileB1 mv fileA2 fileB2 ..... mv fileA20 fileB20 I put these commands in a file, then I need a command to run the file as a whole so that I don't need to type 20 times... Anyone tell me how to... (8 Replies)
Discussion started by: kaixinsjtu
8 Replies
Login or Register to Ask a Question