you can take the exit status of the previous command from
Quote:
$?
.
so after each command is executed check the value $?. if it contains 0 then the previous command was successfully executed else any nonzero value indicates command failed.
Hi ,
I am having one situation in which I need to run some simple unix commands after doing "chroot" command in a shell script. Which in turn creates a new shell.
So scenario is that
- I need to have one shell script which is ran as a part of crontab
- in this shell script I need to do a... (2 Replies)
All, I need to write an unix shell script which inserts some records into a file located in remote servers.
* Get the input from the user and insert according the first row. It should be in ascending order.
123451,XA,ABA
123452,XB,ABB
123453,XC,ABC
123455,XE,ABE
123456,XF,ABF
123458,XG,ABG... (2 Replies)
When my script deals with large input files like 22Gb or 18 GB the basic commands like sort or join fails when run from inside the shell scripts. Can there be any specific reason for this?
For e.g.
sort -u -t "," -k1,1 a.csv > a.csv.uniq"
sort -u -t "," -k1,1 b.csv > b.csv.uniq"
The... (3 Replies)
Hi,
I am having a problem running multiple commands in a autosys command line. For example I would like to run a perl script first and then add sleep command after that in the same autosys job like below
insert_job: xxxxxxxxx
command: `perlscript.pl ; sleep 180`
Perlscript.pl... (0 Replies)
can you help me to create a phone book with add, delete, modify with first name, last name, middle name, phone no(multiple ph no), address, email address, notes or comments to store about the contact and groups that hold for the contact..
i am new to this linux environment. please guide me.
... (1 Reply)
Hi Folks,
I have a text file which may or may not have any data.
I would like to email the file, via a Korn shell script, if the file is not empty.
I am fiddling around with the wc -l command, but no luck so far. The pseudo code is as follows
count=`wc -l test.txt`
if
cat test.txt... (4 Replies)
Hi,
I am pretty new to the unix community and have encountered a problem that I am trying to solve. I have 2 files one of which is called passwd file that looks like the following
Sample Output
daemon:x:1:1:daemon:/usr/sbin:/bin/sh
bin:x:2:2:bin:/bin:/bin/sh
sys:x:3:3:sys:/dev:/bin/sh
... (1 Reply)
Hi
Wishing to all.
I am very new joined in an organization as a unix system administrator.
I need a help in preparing a script for a report.
i have a file contains all of the linux/ubuntu servers line by line around 140 servers.
vi servers.txt
nh01
nh02
nh03
bh01
bh04
-
-
:wq (3 Replies)
Hi,
I have a requirement where in i need to write a shell script to set users password to never expire. I know the command which is used to perform the same .. which is chage command.
But, could not figure out how to do the same in shell script.
Could you please help me with the shell... (3 Replies)
Hi All,
I am trying to use below syntax to find ignore multiple locations while searching for a file.
find / -name "$serviceitem" ! -size 0 2>&1 |egrep -v "tmp|docker|WinSxS|Permission|HISTORY|alternatives|bearer11ssl|manifest"
I tried to assign all the ignore strings to one variable... (2 Replies)
Discussion started by: sravani25
2 Replies
LEARN ABOUT SUSE
while
while(n) Tcl Built-In Commands while(n)
__________________________________________________________________________________________________________________________________________________NAME
while - Execute script repeatedly as long as a condition is met
SYNOPSIS
while test body
_________________________________________________________________DESCRIPTION
The while command evaluates test as an expression (in the same way that expr evaluates its argument). The value of the expression must a
proper boolean value; if it is a true value then body is executed by passing it to the Tcl interpreter. Once body has been executed then
test is evaluated again, and the process repeats until eventually test evaluates to a false boolean value. Continue commands may be exe-
cuted inside body to terminate the current iteration of the loop, and break commands may be executed inside body to cause immediate termi-
nation of the while command. The while command always returns an empty string.
Note: test should almost always be enclosed in braces. If not, variable substitutions will be made before the while command starts execut-
ing, which means that variable changes made by the loop body will not be considered in the expression. This is likely to result in an
infinite loop. If test is enclosed in braces, variable substitutions are delayed until the expression is evaluated (before each loop iter-
ation), so changes in the variables will be visible. For an example, try the following script with and without the braces around $x<10:
set x 0
while {$x<10} {
puts "x is $x"
incr x
}
EXAMPLE
Read lines from a channel until we get to the end of the stream, and print them out with a line-number prepended:
set lineCount 0
while {[gets $chan line] >= 0} {
puts "[incr lineCount]: $line"
}
SEE ALSO
break(n), continue(n), for(n), foreach(n)
KEYWORDS
boolean value, loop, test, while
Tcl while(n)