Interesting question. Code like this:
might be an infinite loop if $sav_files1 and $archive_list point to the same file. And I don't see any other way to get an infinite loop out of this.
I need a quick script that will serve as a sort of "real time monitor" for watching some log files. I am using Bourne shell in HP-UX 10.20. I have basically created a script that never ends, unless of course I manually terminate it. Here's the script (it's called qhistory):
clear
echo "REAL... (3 Replies)
Hi,
I'm pretty new to UNIX shell scripting and need some help. We have an Informatica interface that dumps any files that have errors into a directory. I need to check that directory periodically for any of up to 9 files that might be in it and run a specific process for each file found. The... (3 Replies)
Hi ALL,
I need to take some command line arguments for my script and then want to run a function for each argument.I thought of using for loop as below, but its not working , can some one please help...
#!/bin/ksh
lpar1=$1
lpar2=$2
lpar3=$3
lpar4=$4
lpar5=$5
echo "$lpar1" >>lpar.txt
echo... (4 Replies)
I have about 5000 columns of data that i need to convert all of it into pecentages. for shorter colums i have been using this code:
{print $1/($1+$2)*100,$2/($1+$2),$3/($3+$4)*100 .....}
but this is a teadious process... is there anyway to do it without having to write all of them out?
sample... (20 Replies)
Hi,
PHP user here. I'm using an endless loop to perform to mimic a cron. The script does something every 20 minutes. It sleep()s in the meantime.
I have various checks that ensure that only instance can run, including a "gentleman agreement" locked file.
However, I'd like to make sure... (2 Replies)
Hi,
I want to write a while loop like this can any one say me whats wrong with my loop
USAGE="Usage: Mail.ksh"
integer i=3
while ((1<i<=3))
do
.
.
.
.
(( CMD_JUL = LSD_JUL - i ))
CUR_MAINT_DATE=$(julian2date ${CMD_JUL})
.
.
.
i=i-1
done (1 Reply)
When finding a string in files within a directory, one can use this:
grep -r "searchstring" dir/subdir/ > listofoccurrences.txt
For brevity sake one can enter the intended directory and use this:
grep -r "searchstring" . > listofoccurrences.txt
which as I found out leads to an endless loop,... (2 Replies)
Hi All,
I've written a script to read 2 files and compare the contents using while loop but somehow when $line is not found in test2, the script will continue looping.
Below is my code, pls advise what could went wrong
TIA
Nick
for line in test1.txt | while read line
do
grep -i... (4 Replies)
Hi,
AM very new to shell scripting and try to run a simple do while loop statement, but it ends up running endlessly. please can anyone assist, dunno what am doing wrong, any useful suggestions will be welcomed.
#!/bin/ksh
### To check a running process instance
#################... (5 Replies)
I was practicing writing simple loops as I am a new bash user and I created this script, which turned out to be an endless loop where the echo output does not stop and I do not see where my mistake is.
#!/bin/bash
echo 'enter a number from 1 to 100'
read number
while
do
... (2 Replies)
Discussion started by: goldenlinx
2 Replies
LEARN ABOUT REDHAT
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
}
SEE ALSO
break(n), continue(n), for(n), foreach(n)
KEYWORDS
boolean value, loop, test, while
Tcl while(n)