I wrote a database backup script where I have exec in the script redirecting stdout and stderr in the script to a log file. Hence, when I run the script I don't see any output. But I can run the script as "nohup ./myscript.sh &" then I just tail -f on the log file to see exactly what it is doing.
This is really the preferred way to do it -- from the outside. Complicated schemes with pipes, tees, and fifos are liable to break down, subject to deadlocks, and can make your script dependent on a terminal: Untrustworthy and not worth the trouble. Even 99% success is not good enough. Putting in pipes also messes up the ordering, increases overhead manyfold, and can screw up your terminal prompt afterwards.
When redirecting it from the outside through tee, since you are using BASH, just check the script's return status in PIPESTATUS:
PIPESTATUS is even updated for a single command, so ${PIPESTATUS[0]} remains safe either way, as long as you're using BASH.
Last edited by Corona688; 11-13-2014 at 12:03 PM..
Hi,
How to achieve this? Let us assume the following:
There are 2 scripts a.ksh and b.ksh
$ cat a.ksh
sh b.sh 2>&1 >> /work/log/a_log.txt
$ cat b.sh
echo "abcd"
My requirement is, is there a way to display this abcd in standard output also alongside of writing into a_log.txt?... (8 Replies)
New to Unix scripting and have written two scripts, one calling the other. When it returns to the calling script is it possible to return information, like a return code? :confused: (1 Reply)
Hi all,
I have a script that bulk loads thousands of lines of data. I need to log the output during the execution of the script.
I know I can redirect (">") the output to a file; however, I want the output going to both the screen and the log file.
I thought I could use pipe to pipe the... (10 Replies)
Hi all,
I have two ksh scripts
#sample1.sh
#!/bin/ksh
. ./sample2.sh
echo $fileExist
#sample2.sh
#!/bin/ksh
func()
{
i=1
return $a
}
func
echo $?
Here how should I return the value of sample2.sh back to sample1.sh?
Thanks in advance. (2 Replies)
Hello, I wanted to delete all files which are placed 14 days back. Here is my below script. My script works very well and it deletes all files 14 days back.
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Guys,
I need you help please.
The script below is not working correclty for checking via a awk/if statement . Can you tell me what i am doing wrong in the script code "if($1 == "$RETENTION_LEVEL") "
Syntax
RETENTION_LEVEL=`echo $LINE | cut -f2 -d" "`
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Hi All,
I need to return value to the main shell script, depending on whether the UPDATE command in the embedded pl/sql is successfu or not.
#!bin/ksh
updateStatus=`sqlplus --conn details-- << EOF
DECLARE
var_rows NUMBER;
BEGIN
update table_name
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I am using blow script :--
#!/bin/bash
FIND=$(ps -elf | grep "snmp_trap.sh" | grep -v grep) #check snmp_trap.sh is running or not
if
then
# echo "process found"
exit 0;
else
echo "process not found"
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I have a script that looks like this:
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I want to make a config file which contain all the paths.
i want to read the config file line by line and pass as an argument on my below function.
Replace all the path with reading config path line by line and pass in respective functions.
how can i achieve that?
Kindly guide.
... (6 Replies)