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.
I wanted to display message incase if the delete script is not successful. The below script returns always successful. But the directory... (6 Replies)
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 $LINE | cut -f2 -d" "`
echo " ==============... (4 Replies)
Hi All,
I need to return value to the main shell script, depending on whether the UPDATE command in the embedded pl/sql is successfu or not.
#!bin/ksh
updateStatus=`sqlplus --conn details-- << EOF
DECLARE
var_rows NUMBER;
BEGIN
update table_name
set column_name =... (7 Replies)
I am using blow script :--
#!/bin/bash
FIND=$(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"
exec /home/Ketan_r /snmp_trap.sh 2>&1 & disown -h ... (1 Reply)
I have a script that looks like this:
dirname2=/usr/tmp/filelist/*/*
for dirname2 in /tmp/filelist/*/*; do (cd $dirname2/catalog ||echo "file does not exist" && echo "$dirname2" |cut -d '/' -f 7,8 && echo $i && ls -la |awk 'NR>3 {SUM += $5} END { print "Total number of kb " SUM }');done... (2 Replies)
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)
Discussion started by: sadique.manzar
6 Replies
LEARN ABOUT OSX
script
SCRIPT(1) BSD General Commands Manual SCRIPT(1)NAME
script -- make typescript of terminal session
SYNOPSIS
script [-akq] [-t time] [file [command ...]]
DESCRIPTION
The script utility makes a typescript of everything printed on your terminal. It is useful for students who need a hardcopy record of an
interactive session as proof of an assignment, as the typescript file can be printed out later with lpr(1).
If the argument file is given, script saves all dialogue in file. If no file name is given, the typescript is saved in the file typescript.
If the argument command is given, script will run the specified command with an optional argument vector instead of an interactive shell.
The following options are available:
-a Append the output to file or typescript, retaining the prior contents.
-k Log keys sent to program as well as output.
-q Run in quiet mode, omit the start and stop status messages.
-t time
Specify time interval between flushing script output file. A value of 0 causes script to flush for every character I/O event. The
default interval is 30 seconds.
The script ends when the forked shell (or command) exits (a control-D to exit the Bourne shell (sh(1)), and exit, logout or control-D (if
ignoreeof is not set) for the C-shell, csh(1)).
Certain interactive commands, such as vi(1), create garbage in the typescript file. The script utility works best with commands that do not
manipulate the screen. The results are meant to emulate a hardcopy terminal, not an addressable one.
ENVIRONMENT
The following environment variable is utilized by script:
SHELL If the variable SHELL exists, the shell forked by script will be that shell. If SHELL is not set, the Bourne shell is assumed. (Most
shells set this variable automatically).
SEE ALSO csh(1) (for the history mechanism).
HISTORY
The script command appeared in 3.0BSD.
BUGS
The script utility places everything in the log file, including linefeeds and backspaces. This is not what the naive user expects.
It is not possible to specify a command without also naming the script file because of argument parsing compatibility issues.
When running in -k mode, echo cancelling is far from ideal. The slave terminal mode is checked for ECHO mode to check when to avoid manual
echo logging. This does not work when in a raw mode where the program being run is doing manual echo.
BSD January 22, 2004 BSD