07-28-2010
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1. Shell Programming and Scripting
i downloaded a text file from metalab.unc.edu called sh.txt and in this reference manual it refers to shell scripting exit status .. at the end of one of the examples that author gave an exit status of 127..
to what does a 127 exit status refer too and what is its purpose in the code.
moxxx68 (1 Reply)
Discussion started by: moxxx68
1 Replies
2. Shell Programming and Scripting
Hi,
Consider the output of the following commands:
case1)
-------
# ifconfig -a | grep "UP" | grep uplink0:1
# echo $?
Output is: 0
case2
------
# ifconfig -a | grep "UP" | grep uplink0:1; echo $?
Output is: 1
In case2 we got the exit code as 1, which is the actual exit code.... (1 Reply)
Discussion started by: diganta
1 Replies
3. Shell Programming and Scripting
I hope one of you smart people out there can help me with what seems like a real simple questing but I can't quite figure out.
In a script I am doing a cmp on two files. I am trying to check the exit status with an if statement but can't seem to figure out the syntax. If the exit status is 1 I... (4 Replies)
Discussion started by: PrimeRibAndADew
4 Replies
4. Shell Programming and Scripting
Hi all,
I'm running a program which return 1 upon success.
But when encounters problem shell return 's '1' .
How to differentiate between them the shell return value and script return value.
Ex. function fn return '1' if executed successfully and '0' if failed. But when if shell encounters... (1 Reply)
Discussion started by: yhacks
1 Replies
5. Shell Programming and Scripting
I'm preparing for exam and one of exams is to write own test command...
I wonder if in unix is a command which just returns exit code you specify..
I know I can easily write a function like this:
exStatus() {
return $1
}
-> my question is rather theoretical
thank you! (9 Replies)
Discussion started by: MartyIX
9 Replies
6. Shell Programming and Scripting
I am trying to get the exit status of grep and test a condition with it, But it does not seem to be working as expected since i am doing something wrong apparently
as per grep help
Exit status is 0 if match, 1 if no match,
and 2 if trouble.
My problem is something like this
templine - a... (7 Replies)
Discussion started by: prasbala
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7. Shell Programming and Scripting
I have a shell script (#!/bin/sh) that interacts with Appworx and Banner Admin. In my script I want to check the exit status of awrun before continuing. awrun can run for 10 seconds or it can run for over a minute. So my question is, will it go through my if statement before awrun may even be... (2 Replies)
Discussion started by: smkremer
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8. Shell Programming and Scripting
Hi ,
I have a bash script , which does the network configuration. Messages from this script are dumped on console as well as stored in a log file .
This script is invoked from a C code using system call . The script returns different exit code , to indicate different error cases. The... (1 Reply)
Discussion started by: abhirai
1 Replies
9. Shell Programming and Scripting
Hi All,
I am trying to create a zip file with all the txt files(these are in large number) in the current directory. I am able to do this operation sucessfully.
After this i want to get the status of the tar command executed and do accordingly. When i am trying with the below code, the status... (3 Replies)
Discussion started by: paddu
3 Replies
10. Shell Programming and Scripting
Hi all,
I am trying to use a script (a.sh) which is calling another script(b.sh).
And I want to use the exit code(set by me) of b.sh in a.sh.
I am using this in b.sh
#!/bin/sh
<-- code -->
if ; then
exit 0
else
exit 1
fiBut... (2 Replies)
Discussion started by: Raj999
2 Replies
LEARN ABOUT FREEBSD
swapon
SWAPON(8) BSD System Manager's Manual SWAPON(8)
NAME
swapon, swapoff, swapctl -- specify devices for paging and swapping
SYNOPSIS
swapon [-F fstab] -aLq | file ...
swapoff [-F fstab] -aLq | file ...
swapctl [-AghklmsU] [-a file ... | -d file ...]
DESCRIPTION
The swapon, swapoff and swapctl utilities are used to control swap devices in the system. At boot time all swap entries in /etc/fstab are
added automatically when the system goes multi-user. Swap devices use a fixed interleave; the maximum number of devices is unlimited. There
is no priority mechanism.
The swapon utility adds the specified swap devices to the system. If the -a option is used, all swap devices in /etc/fstab will be added,
unless their ``noauto'' or ``late'' option is also set. If the -L option is specified, swap devices with the ``late'' option will be added
as well as ones with no option. If the -q option is used, informational messages will not be written to standard output when a swap device
is added.
The swapoff utility removes the specified swap devices from the system. If the -a option is used, all swap devices in /etc/fstab will be
removed, unless their ``noauto'' or ``late'' option is also set. If the -L option is specified, swap devices with the ``late'' option will
be removed as well as ones with no option. If the -q option is used, informational messages will not be written to standard output when a
swap device is removed. Note that swapoff will fail and refuse to remove a swap device if there is insufficient VM (memory + remaining swap
devices) to run the system. The swapoff utility must move swapped pages out of the device being removed which could lead to high system
loads for a period of time, depending on how much data has been swapped out to that device.
Other options supported by both swapon and swapoff are as follows:
-F fstab
Specify the fstab file to use.
The swapctl utility exists primarily for those familiar with other BSDs and may be used to add, remove, or list swap devices. Note that the
-a option is used differently in swapctl and indicates that a specific list of devices should be added. The -d option indicates that a spe-
cific list should be removed. The -A and -U options to swapctl operate on all swap entries in /etc/fstab which do not have their ``noauto''
option set.
Swap information can be generated using the swapinfo(8) utility, pstat -s, or swapctl -l. The swapctl utility has the following options for
listing swap:
-h Output values in human-readable form.
-g Output values in gigabytes.
-k Output values in kilobytes.
-m Output values in megabytes.
-l List the devices making up system swap.
-s Print a summary line for system swap.
The BLOCKSIZE environment variable is used if not specifically overridden. 512 byte blocks are used by default.
FILES
/dev/{ada,da}?s?b standard paging devices
/dev/md? memory disk devices
/etc/fstab ASCII file system description table
DIAGNOSTICS
These utilities may fail for the reasons described in swapon(2).
SEE ALSO
swapon(2), fstab(5), init(8), mdconfig(8), pstat(8), rc(8)
HISTORY
The swapon utility appeared in 4.0BSD. The swapoff and swapctl utilities appeared in FreeBSD 5.1.
BSD
November 22, 2013 BSD