Sponsored Content
Top Forums Shell Programming and Scripting Retrieving previous command in a script Post 303002744 by RavinderSingh13 on Thursday 31st of August 2017 11:41:36 AM
Old 08-31-2017
Quote:
Originally Posted by SkySmart
The OS is any Unix system and I intend to use it across all platforms.
But if you need me to narrow it down:
Code:
OS:
RedHat
CentOS
Fedora
AIX
Raspian
Ubuntu
Shell: 
/bin/sh

Hello SkySmart,

Could you please try the following script and let me know if this helps you.
Code:
cat script.ksh
trap 'previous_command=$this_command; this_command=$BASH_COMMAND' DEBUG
ps -ef | egrep talling
StoreThisLastCommandA=$previous_command
awk '/error/ {print $3}' /tmp/test
StoreThisLastCommandB=$previous_command
##Printing the variables values here.
echo "Value of variable StoreThisLastCommandA is: " $StoreThisLastCommandA
echo "Value of variable StoreThisLastCommandB is:" $StoreThisLastCommandB

Since I don't have sh with me so I haven't tested it though I believe it should work properly, kindly do let me know on same.

Thanks,
R. Singh
These 2 Users Gave Thanks to RavinderSingh13 For This Post:
 

10 More Discussions You Might Find Interesting

1. UNIX for Dummies Questions & Answers

getting the previous command

Hello all I'm on SunOS5.9 and I'm trying to make the arrow keys work as in DOS ..get the previous command , etc .. I searched this site and got an answer. I pasted the following code to my .kshrc file in my home directory...It still does not seem to work ...Am I missing anything here ? I'm... (5 Replies)
Discussion started by: luft
5 Replies

2. UNIX for Dummies Questions & Answers

Retrieving the execution time of a completed command

Hello, I am new to this forum and relatively new to unix, but hope to become an expert soon! My question is: How can I find out the execution time of a command that has already completed execution? More specifically, I launched a Python script to populate a PostgreSQL database on Suse... (2 Replies)
Discussion started by: marina
2 Replies

3. UNIX for Dummies Questions & Answers

Seeing previous command

Guys, In work we have just gotten a new HP 9000 server and I'm trying to set it up so that if I press <Up arrow> key I can see the command I typed in last(and press enter to run it again). Can anyone advise how to set this up. One friend suggested I touch a file called .toucheditXXXX (I cant... (4 Replies)
Discussion started by: JackieChan
4 Replies

4. UNIX for Advanced & Expert Users

Previous Command

We have a Solaris Server and I am acessing it through telnet to run various commands for my data validation like GREP, SED, AWK etc. My requirement is how do i use the previous command that was executed. I tried the option 'ESC' and then 'k'. It displays the characters like '^[[A' etc. How do I... (0 Replies)
Discussion started by: vskr72
0 Replies

5. Shell Programming and Scripting

Previous Command

We have a Solaris Server and I am acessing it through telnet to run various commands for my data validation like GREP, SED, AWK etc. My requirement is how do i use the previous command that was executed. I tried the option 'ESC' and then 'k'. It displays the characters like '^[[A' etc. How do I... (1 Reply)
Discussion started by: vskr72
1 Replies

6. UNIX for Dummies Questions & Answers

Previous Command

We have a Solaris Server and I am acessing it through telnet to run various commands for my data validation like GREP, SED, AWK etc. My requirement is how do i use the previous command that was executed. I tried the option 'ESC' and then 'k'. It displays the characters like '^[[A' etc. How do I... (2 Replies)
Discussion started by: vskr72
2 Replies

7. HP-UX

Retrieving the full command

Hi All, I would like to retrieve the whole command that got executed for a running process rather than a truncated string, as a result of running ps -ef on HP-UX. Please help. TIA (1 Reply)
Discussion started by: trocadero
1 Replies

8. HP-UX

Previous command

Hi, i would like to retrieve (only retrieve, not execute) a previous command which i executed on the command prompt. I tried the 'up arrow' key, but its not working. Instead,it showed me some funny characters. I searched around and i found the way to do it was using the way below. Several... (5 Replies)
Discussion started by: new2ss
5 Replies

9. UNIX for Advanced & Expert Users

Retrieving command line arguments of a particular PID

hi The "ps" command shows the command line arguments of running processes: $ /bin/ps -o pid,args -e .... 26031 pico /tmp/crontab2KaG1Y 596 /usr/lib/sendmail -bd -q15m 9955 xterm -n 1 -sb -sl 800 -g 80+70+70 2627 /usr/sbin/snmpd -Lsd -Lf /dev/null -p /var/run/snmpd -a 1691 .... I... (2 Replies)
Discussion started by: Andrewkl
2 Replies

10. Shell Programming and Scripting

Retrieving values from tab-delimited file in unix script

Hi I am trying to retrieve values from a tab-delimited file.I am using while read record value=`echo $record | cut -f12` done Where 12 is the column no i want retieve and record is one line of the file. But it is returning the full record. Plz help (4 Replies)
Discussion started by: akashtcs
4 Replies
dtc_install_centos(8)					      System Manager's Manual					     dtc_install_centos(8)

NAME
dtc_install_centos - bootstrap a CentOS install to use in a chroot or VM SYNOPSIS
dtc_install_centos <install root> <yum environment> DESCRIPTION
This shell script is part of the dtc-xen package, generally to be used by the dtc panel to install a new a Xen VPS server. This script is called by dtc_reinstall_os when the user chooses to install the CentOS operating system. How it works: it generates a temporary yum configuration in the yum environment directory, that directs yum to act inside the install root instead of in the base system; then it kindly requests yum to install the basesystem, centos-release and yum packages onto it. Yum then uses the configuration to download the required (usually, security-updated) packages and then perform the RPM installation process under the install root. It requires both RPM and yum. It does work under Debian (it was developed in Ubuntu first). It should also work on RPM-based systems without destroying the system-wide RPM and yum configurations. OPTION
<install root> Target directory where CentOS will be deployed. Must exist beforehand. <yum environment> Directory where yum will store the repository manifests and configuration. Will be automatically created. Cached RPMs and manifests will be left, as usual, in a directory var/cache/yum inside the install root. EXAMPLE
dtc_install_centos /root/yum /xen/13 This will setup the operating system in /xen/13, with the CentOS configuration folder in /root/yum. BUGS
It's limited to CentOS 5 at the moment. It must be run as root. Under some circumstances, the installation process itself may kill processes running on the host machine. The chroot yum does should be sufficient to avoid this, but we haven't been able, yet, to ascertain why this fails sometimes. SEE ALSO
dtc_reinstall_os(8) VERSION
This documentation describes dtc_install_os version 0.3.1. See http://www.gplhost.com/software-dtc-xen.html for updates. dtc_install_centos(8)
All times are GMT -4. The time now is 06:14 PM.
Unix & Linux Forums Content Copyright 1993-2022. All Rights Reserved.
Privacy Policy