Hi MadeinGermany
I cannot use single quotes as there are several SQLs using string literals with single quotes within the su -c block that can cause the shell to get confused.
For eg: select to_char(sysdate,'DD/MM/YYYY HH24:MI:SS') from dual;
Thank you for pointing out the missing escape character for the second $counter variable
ongoto's suggestion of escaping the backtick seems to fix this issue. The following script has worked.
I need to check if it works in my real life script. THANK YOU BOTH VERY MUCH.
Code:
# cat realLife.sh
sudo su - appuser -c "
export counter=1
while true
do
if grep -iq BASKETBALL /tmp/somestring.txt
then
echo This loop iterated \$counter times before exiting..
break
fi
sleep 5
counter=\`expr \$counter + 1\`
done
"
Another question, is it possible to, in a for-loop incrementing until it reaches a certain number, to have it loop again without incrementing? Just have it drop what it is doing when it reaches this command and start again at the same number it was at? I know I could make a while loop and just... (0 Replies)
Hi All,
I amlearning UNIX scripting. I have a small query. I would be thankful if any one helps me out.
I have a below piece of code which delets the files. If file dosent have the permissions to delete a particular file I have used 2>>operator to track the error code.
But my objective is... (1 Reply)
I wonder how to stop further loop iterations when conditions gets false e.g.
This file.txt contains the following structure :
1
2
3
4
5
6
7
8
9
10
How to stop iteration when if statement gets false ?
for n in `cat file.txt`
do
if (( n<=5 )) (1 Reply)
question :how can i iterate to next item in for loop with the loop
e.g
for i in `cat abc.txt`
do
echo $i // this will display first line
i=$i+1; // this doesnt work for me.
echo $i; //this will display secound line
done
question: is my approach to manipulate text good?
I have... (3 Replies)
I have written the following script to update some Debian boxes.
#!/bin/bash
mxg_hosts_file="/etc/mxg/ssh-hosts"
while read line ; do
mxg_host="$(echo ${line} | awk -F":" '{print $1}')"
mxg_port="$(echo ${line} | awk -F":" '{print $2}')"
echo "Connecting and Upgrading... (3 Replies)
for VGLIST in `lsvg -o`
do
CLOSED_OUT=`echo $VGLIST | lsvg -l $VGLIST | awk '{print $6 " " $7}' | grep closed`
if ]; then
echo "Filesystems $CLOSED_OUT in VG that are in Closed status"
else
echo "\n Some message"
fi
Above Code is working fine, but echo "Filesystems $CLOSED_OUT... (8 Replies)
I have a script with logic like:
my_function()
{
if
mkdir $1
mkdir mydir_${2}
else
do something else
fi
}
read in list of items
while read list
do
my_function $list `date`
done
so basically it will make a directory for every name in the list and create a directory with the... (6 Replies)
I am trying to check multiple server's "uptime" in a loop over "ssh".
When I execute multiple ssh commands with hard coded servernames script is executing fine.
But when I pass server names using while loop, script is exiting after checking first server's status, why?
# serverList... (8 Replies)
Hello,
I have been stuck on this for some time and invested many hours trying to find a solution. I am trying to either loop through two variables or or two arrays and not sure how to do it. I am limited to ksh only, and don't have the ability to do a foreach, or for i AND for j etc...I... (19 Replies)
Hello,
I've written a script to automate encoding of all the MP4 files in a directory (incl. subdirectories). But unfortunately it's running for the first MP4 file only.
My machine details:
root@Ubuntu16:~# uname -a
Linux Ubuntu16 4.10.0-28-generic #32~16.04.2-Ubuntu SMP Thu Jul 20 10:19:48... (2 Replies)
Discussion started by: prvnrk
2 Replies
LEARN ABOUT DEBIAN
ns_while
ns_lctl(3aolserver) AOLserver Built-In Commands ns_lctl(3aolserver)__________________________________________________________________________________________________________________________________________________NAME
ns_for, ns_foreach, ns_while, ns_lctl - Replacements for standard Tcl loop commands which enable monitoring and control
SYNOPSIS
ns_for start test next body
ns_foreach varname list body
ns_foreach varlist1 list1 ?varlist2 list2 ...? body
ns_while test body
ns_lctl cancel id
ns_lctl eval id script
ns_lctl info id
ns_lctl install command
ns_lctl list
ns_lctl pause id
ns_lctl result id
_________________________________________________________________DESCRIPTION
The ns_for, ns_foreach, and ns_while commands are replacements for cooresponding Tcl commands with the additional capability of monitoring
and control through the ns_lctl command.
ns_for start test next body
See the for(n) man page for usage.
ns_foreach start test next body
See the foreach(n) man page for usage.
ns_foreach varlist1 list1 ?varlist2 list2 ...? body
See the foreach(n) man page for usage.
ns_while test body
See the while(n) man page for usage.
ns_lctl cancel id
Mark the given loop to cancel at the next iteration, resulting in the loop returning with TCL_ERROR.
ns_lctl eval id script
ns_lctl info id
ns_lctl install command
ns_lctl list
ns_lctl pause id
ns_lctl result id
SEE ALSO
for(n), foreach(n), while(n)
KEYWORDS
threads, iteration, list, looping, cancel
AOLserver 4.5 ns_lctl(3aolserver)
01-06-2015
