Login or Register to Ask a Question and Join Our Community

Sponsored Content
Full Discussion: Subtracting Variables which are commands
Top Forums UNIX for Dummies Questions & Answers Subtracting Variables which are commands Post 1771 by PxT on Thursday 29th of March 2001 10:55:10 AM
Old 03-29-2001
This gets tricky because what if their login time is 2:59, and the logout time is 3:10. 3:10-2:59=? The shell doesn't know that you are trying to subtract times, it just sees numbers with a colon in the middle. A better way to do this might be to use the 'last' command, as one of the fields it provides is the total log in time.
 

10 More Discussions You Might Find Interesting

1. UNIX for Dummies Questions & Answers

Subing Variables with commands.

Hi, I'm back! Ok, I'm trying to use a variable with a value of a unix command. So when I try a=`ls`, then echo $a I get the correct answer. But when I try it with a pipe: a=`ls | wc -c`, then echo $a I get: filename: a: command not found I've tried so many ways I presumme it's the pipe... (1 Reply)
Discussion started by: Astudent
1 Replies

2. Shell Programming and Scripting

Referencing variables in commands

The script I am writing must be able to run several commands (tar, gzip etc) on filenames that are supplied by variables. I am unsure as to what syntax is required/ideal when referencing variables in filenames. The following is a sample command that I would like the script to execute: tar cvf... (3 Replies)
Discussion started by: mharley
3 Replies

3. Shell Programming and Scripting

Using variables in sed commands

Hi there, I need to be able to put the hostid of my box into a file (replacing the text "enter_hostid_here" so i tried sed -e 's/enter_hostid_here/`hostid`/g' inputfile > outputfile but it takes the `hostid` literally as text .....how can I get this info into the file (ideally in a single... (2 Replies)
Discussion started by: hcclnoodles
2 Replies

4. Shell Programming and Scripting

Storing commands in $variables.

Hi I'm trying to store commands in variables... like so.. # lastcmd=" $t1 | $t2 | $t3 | $t4 | sort | uniq" t1="sed -e 's/http:/<li><a href=\"http:/'" t2="sed -e 's/http:.*/&\">&<\/a>Web Link<br>/'" t3="sed -e 's/.*. mailto:/<li><a href=\"mailto:/'" t4="sed -e... (7 Replies)
Discussion started by: Paulw0t
7 Replies

5. Shell Programming and Scripting

subtracting variables in ksh

hi all, how do i subract variables in shell ?? am trying to space out the headers and the output generated by the shell so they all line up : currently the output is like this : servers : users server1 : 10 latestServer : 50 so i thought... (3 Replies)
Discussion started by: cesarNZ
3 Replies

6. Shell Programming and Scripting

Using variables within awk/sed commands

Can I use my own variables within awk and sed for example: I've written a while loop with a counter $i and I want to use the value of $i within sed and awk to edit certain lines of text within a data file. I want to use : sed '1s/$/texthere/g' data.csv Like this: sed '$is/$/$age/g' data.csv... (5 Replies)
Discussion started by: mustaine85
5 Replies

7. Shell Programming and Scripting

Piping through commands read as variables from file

This is going to be part of a longer script with more features, but I have boiled it down to the one thing that is presently stumping me. The goal is a script which checks for updates to web pages that can be run as a cron job. The script reads (from a tab-delim file) a URL, an MD5 digest, and an... (1 Reply)
Discussion started by: fitzwilliam
1 Replies

8. Shell Programming and Scripting

Send Remote Commands via SSH with variables

Hi there I found the Command to send commands to other servers like: sv01> ssh user@sv02 'ps -ef' But I cant use Variables from a script i want to execute on another server like: sv01> ssh user@sv02 'cd $SCRIPTHOME' although the variable is set on sv01. How can I run commands on sv02 with... (2 Replies)
Discussion started by: DarkSwiss
2 Replies

9. Shell Programming and Scripting

Variables into SED or AWK and multiple commands

Hello I am hoping you may help. I am not sure how to go about this exactly, I know the tools but not sure how to make them work together. I have two SED commands that I would like to run in a shell script. I would like to take the manual input of a user (types in when prompted) to be used... (4 Replies)
Discussion started by: lostincashe
4 Replies

10. Shell Programming and Scripting

How to put variables commands in config files?

Hi All, Seeking for your assistance on how to put in variables all the commands in /bin config files: /home/test/config_file/config.cfg cat /home/test/config_file/config.cfg ECHO=/bin/echo LS=/bin/lsMain script cat test.sh source=/home/test/config_file/config.cfg ECHO=$ECHO LS=$LS#i... (3 Replies)
Discussion started by: znesotomayor
3 Replies

LEARN ABOUT OSF1

lsmsad

lsmsad(8)						      System Manager's Manual							 lsmsad(8)

NAME

       lsmsad - Starts the Storage Administrator (SA) daemon

SYNOPSIS

       /usr/sbin/lsmsad

DESCRIPTION

       The SA daemon, lsmsad, is a process required by lsmsa, the SA graphical user interface (GUI). The daemon issues commands and obtains system
       information on behalf of SA.

       The SA daemon runs on a Tru64 UNIX system on which LSM is initialized and running.  The SA client runs on any  machine  that  supports  the
       Java Runtime Environment.

       The SA daemon is automatically started at boot time. Under normal conditions, the daemon does not need to be run manually.

       If SA does not start during the boot process, enter:

       /sbin/init.d/lsmsa stop

       To restart SA, enter:

       /sbin/init.d/lsmsa start

       Only one SA daemon can be running on a system at a given time. If a second SA daemon attempts to start, it will fail.

RESTRICTIONS

       You must be root user to run lsmsad.

FILES

       The script that starts lsmsad at boot time.  The command log file that tracks SA tasks.	The access log file that tracks login to  SA.  The
       server log file that tracks server startup information and server errors.  The log maintenance shell script that saves and  compresses  log
       files.

SEE ALSO

       lsmsa(8), volintro(8)

																	 lsmsad(8)
All times are GMT -4. The time now is 11:17 PM.
Unix & Linux Forums Content Copyright 1993-2022. All Rights Reserved.
Privacy Policy