08-08-2014
Quote:
Originally Posted by
Michael Stora
Yes, but I know the folder numbers are unique. I another script I test the exit status of ls when there are multiple matches but in this script calling the non-builtin 'ls' bogs things down as there are about 10,000 of these files to parse.
You know, $( ) isn't exactly a "built in" either, a fork and a subshell is involved.
How much data is in each of these files? Are they single lines? You might be able to use
read instead of <, which WOULD be a builtin. It could be dramatically faster when there's thousands to do. Or perhaps
readarray if there's multiple lines.
Reading thousands of lines into the shell at once may not be the best plan in any case, however, especially if the files can be used directly when you need them instead.
10 More Discussions You Might Find Interesting
1. Shell Programming and Scripting
How can I redirect and append stdout and stderr to a file when using cron? Here is my crontab file:
*/5 * * * * /dir/php /dir/process_fns.php >>& /dir/dump.txt
Cron gives me an 'unexpected character found in line' when trying to add my crontab file.
Regards,
Zach Curtis
POPULUS (8 Replies)
Discussion started by: zcurtis
8 Replies
2. Shell Programming and Scripting
Hello all
im using tcsh shell on sun Solaris , using the Make utility for compilation
i will like to be able to redirect the stderr to file , how can it be done ? (0 Replies)
Discussion started by: umen
0 Replies
3. Shell Programming and Scripting
Hi friends
I am facing one problem while redirecting the out of the stderr and stdout to a file
let example my problem with a simple example
I have a file (say test.sh)in which i run 2 command in the background
ps -ef &
ls &
and now i am run this file and redirect the output to a file... (8 Replies)
Discussion started by: sushantnirwan
8 Replies
4. UNIX for Dummies Questions & Answers
I'm using below command to redirect stderr to a file but I also want to add timestamp to stderr.out to find out the date / time the error occurred.
ls -ltr 2>>/tmp/stderr.out
Thanks (5 Replies)
Discussion started by: mbak
5 Replies
5. Shell Programming and Scripting
Hi
I am not if this is possible: is it possible in bach (or another shell) to redirect GLOBALLY the stdout/stderr channels to a file.
So, if I have a script
script.sh
cmd1
cmd2
cmd3
I want all stdout/stderr goes to a file. I know I can do:
./script.sh 1>file 2>&1
OR
... (2 Replies)
Discussion started by: islegmar
2 Replies
6. Shell Programming and Scripting
Hello
I read a lot of post related to this topic, but nothing helped me. :mad:
I'm running a ksh script with subshell what processing some ldap command. I need to check output for possible errors.
#!/bin/ksh
...
readinput < $QCHAT_INPUT |&
while read -p line
do
echo $line
... (3 Replies)
Discussion started by: Osim
3 Replies
7. Shell Programming and Scripting
Hello everyone,
I'm a nooby in Linux, and I need some help.
I have a shell script like this:
echo "Start of script" > ../My_Log_Dir/Script_Name.log
..
cp ../My_DataIn/File.txt ../My_DataOut/ 2>> ../My_Log_Dir/Script_Name.log
rc=$?
..
echo "End of Script" >>... (5 Replies)
Discussion started by: H.Faria
5 Replies
8. Shell Programming and Scripting
I have the following:
remsh $host -n 2>>syslog_issue_list.txt grep -i -e "EMS" -e "error" -e "warning" -e "excessive" /var/adm/syslog/syslog.log |
awk /"$DATE1"/ | awk -vhost="$host" '!/remsh|telnetd/{print host "\n", $0 >> "syslog_issue_list.txt"}'
I am creating a health script that has... (4 Replies)
Discussion started by: chipblah84
4 Replies
9. Shell Programming and Scripting
Dear all,
redirecting STDOUT & STDERR to file is quite simple, I'm currently using:
exec 1>>/tmp/tmp.log; exec 2>>/tmp/tmp.logBut during script execution I would like the output come back again to screen, how to do that?
Thanks
Lucas (4 Replies)
Discussion started by: Lord Spectre
4 Replies
10. Shell Programming and Scripting
Dear all,
redirecting STDOUT & STDERR to file is quite simple, I'm currently using:
Code:
exec 1>>/tmp/tmp.log; exec 2>>/tmp/tmp.log
But during script execution I would like the output come back again to screen, how to do that?
Thanks
Luc
edit by bakunin: please use CODE-tags like the... (6 Replies)
Discussion started by: tmonk1
6 Replies
exit(1) User Commands exit(1)
NAME
exit, return, goto - shell built-in functions to enable the execution of the shell to advance beyond its sequence of steps
SYNOPSIS
sh
exit [n]
return [n]
csh
exit [ ( expr )]
goto label
ksh
*exit [n]
*return [n]
DESCRIPTION
sh
exit will cause the calling shell or shell script to exit with the exit status specified by n. If n is omitted the exit status is that of
the last command executed (an EOF will also cause the shell to exit.)
return causes a function to exit with the return value specified by n. If n is omitted, the return status is that of the last command exe-
cuted.
csh
exit will cause the calling shell or shell script to exit, either with the value of the status variable or with the value specified by the
expression expr.
The goto built-in uses a specified label as a search string amongst commands. The shell rewinds its input as much as possible and searches
for a line of the form label: possibly preceded by space or tab characters. Execution continues after the indicated line. It is an error to
jump to a label that occurs between a while or for built-in command and its corresponding end.
ksh
exit will cause the calling shell or shell script to exit with the exit status specified by n. The value will be the least significant 8
bits of the specified status. If n is omitted then the exit status is that of the last command executed. When exit occurs when executing
a trap, the last command refers to the command that executed before the trap was invoked. An end-of-file will also cause the shell to exit
except for a shell which has the ignoreeof option (See set below) turned on.
return causes a shell function or '.' script to return to the invoking script with the return status specified by n. The value will be the
least significant 8 bits of the specified status. If n is omitted then the return status is that of the last command executed. If return
is invoked while not in a function or a '.' script, then it is the same as an exit.
On this man page, ksh(1) commands that are preceded by one or two * (asterisks) are treated specially in the following ways:
1. Variable assignment lists preceding the command remain in effect when the command completes.
2. I/O redirections are processed after variable assignments.
3. Errors cause a script that contains them to abort.
4. Words, following a command preceded by ** that are in the format of a variable assignment, are expanded with the same rules as a vari-
able assignment. This means that tilde substitution is performed after the = sign and word splitting and file name generation are not
performed.
ATTRIBUTES
See attributes(5) for descriptions of the following attributes:
+-----------------------------+-----------------------------+
| ATTRIBUTE TYPE | ATTRIBUTE VALUE |
|Availability |SUNWcsu |
+-----------------------------+-----------------------------+
SEE ALSO
break(1), csh(1), ksh(1), sh(1), attributes(5)
SunOS 5.10 15 Apr 1994 exit(1)