Visit Our UNIX and Linux User Community

Top Forums Shell Programming and Scripting Help with bash script problem Post 302850885 by Scott on Thursday 5th of September 2013 11:18:03 PM
Old 09-06-2013
You will have to negate the tests, or swap around the code in your if "then" and "else" blocks.
This User Gave Thanks to Scott For This Post:
Test Your Knowledge in Computers #142
Difficulty: Easy
Version 4 Unix was rewritten in C in 1977.
True or False?

10 More Discussions You Might Find Interesting

1. Shell Programming and Scripting

bash script problem

hi I am writing a bash script that uses dialog to get user input an diplay messages to user. I have a small problem dialog --inputbox "blabla" 20 50 2> /tmp/output VAR="'cat /tmp/output'" mkdir $VAR the code below requests user for a directory path to be created. But, if the user uses... (1 Reply)
Discussion started by: fnoyan
1 Replies

2. UNIX for Dummies Questions & Answers

Bash script argument problem

I'm having problems with bash scripts. If a bash script is called with no arguments, I always get "PHIST=!" as the first argument (i.e. this is what $1 equals). Why? Where does this come from, and how can I fix it? Nothing in the bash man pages refer to this mysterious default argument. (2 Replies)
Discussion started by: sszd
2 Replies

3. Shell Programming and Scripting

Problem in bash script

I have written a script and I get error and I don't understand why. neededParameters=2 numOfParameters=0 correctNum=0 while getopts "s:l:" opt do case "$opt" in s) serviceName= $OPTARG #errorline 1 numOfParameters= $numOfParameters + 1 ;; l) ... (12 Replies)
Discussion started by: programAngel
12 Replies

4. Shell Programming and Scripting

Simple bash script problem

#!/bin/bash cd /media/disk-2 Running ./ it's not changing directory.Why? (6 Replies)
Discussion started by: cola
6 Replies

5. Shell Programming and Scripting

problem using variables in bash script

I am using variable to give the location of the file I am using but I get error. Here is the code: LogFile=/tmp/ echo -e "could not close the service - error number $error \n" > $LogFile well this is not all the code but is enough because the problem start when I try to use the... (3 Replies)
Discussion started by: programAngel
3 Replies

6. Shell Programming and Scripting

help with a bash script problem

hi to everyone :) i am new to linux and bash and i am trying to build a bash script, that is quite similar to the well known cmd 'split' ... ;) it is now already "working" ... i can use it like: ./ -v -s 10 foo ./ -s 10 -v foo ./ -s 10 foo ./ -v... (5 Replies)
Discussion started by: drjodo
5 Replies

7. Shell Programming and Scripting

Problem using grep in bash script

When it comes to programing and UNIX, I know just enough to be really really dangerous. I have written a python script to parse through a file that contains ~1 million lines. Depending on whether a certain string is matched, the line is copied into a particular file. For the sake of brevity,... (4 Replies)
Discussion started by: errcricket
4 Replies

8. Shell Programming and Scripting

Problem with Bash Script.

Hi guys! I'm new to the forum and to the Bash coding scene. I have the following code paths=/test/a paths=/test/b keywords=\"*car*\" keywords=\"*food*\" for file in `find paths -type f -ctime -1 -name keywords -print 2>/dev/null` do #.... do stuff here for every $file found... (5 Replies)
Discussion started by: RedSpyder
5 Replies

9. Shell Programming and Scripting

Bash/awk script problem

Hi, I have 100 files containing different values in single column, I want to split those files in two separate files (file2 and file3) based on average value of first column of each file, for those files I am working on the following script #bin/bash for memb in $(seq 1 100) do awk... (4 Replies)
Discussion started by: dsp80
4 Replies

10. UNIX for Beginners Questions & Answers

Array problem in Bash Script

I am trying to write a Bash Script using a couple of arrays. I need to perform a countdown of sorts on an array done once daily, but each day would start with the numbers from the previous day. This is what I'm starting with : #!/bin/bash days=(9 8 7 6 5) for (( i = 0 ; i < ${#days} ; i++... (4 Replies)
Discussion started by: cogiz
4 Replies
swap(1M)                                                  System Administration Commands                                                  swap(1M)

swap - swap administrative interface SYNOPSIS
/usr/sbin/swap -a swapname [swaplow] [swaplen] /usr/sbin/swap -d swapname [swaplow] /usr/sbin/swap -l /usr/sbin/swap -s DESCRIPTION
The swap utility provides a method of adding, deleting, and monitoring the system swap areas used by the memory manager. OPTIONS
The following options are supported: -a swapname Add the specified swap area. This option can only be used by the super-user. swapname is the name of the swap file: for example, /dev/dsk/c0t0d0s1 or a regular file. swaplow is the offset in 512-byte blocks into the file where the swap area should begin. swaplen is the desired length of the swap area in 512-byte blocks. The value of swaplen can not be less than 16. For example, if n blocks are specified, then (n-1) blocks would be the actual swap length. swaplen must be at least one page in length. The size of a page of memory can be determined by using the pagesize command. See pagesize(1). Since the first page of a swap file is automatically skipped, and a swap file needs to be at least one page in length, the minimum size should be a multiple of 2 pagesize bytes. The size of a page of memory is machine dependent. swaplow + swaplen must be less than or equal to the size of the swap file. If swaplen is not specified, an area will be added starting at swaplow and extending to the end of the designated file. If neither swaplow nor swaplen are specified, the whole file will be used except for the first page. Swap areas are normally added automatically during system startup by the /sbin/swapadd script. This script adds all swap areas which have been specified in the /etc/vfstab file; for the syntax of these specifications, see vfstab(4). To use an NFS or local file-system swapname, you should first create a file using mkfile(1M). A local file-system swap file can now be added to the running system by just running the swap -a command. For NFS mounted swap files, the server needs to export the file. Do this by performing the following steps: 1. Add the following line to /etc/dfs/dfstab: share -F nfs -o rw=clientname,root=clientname path-to-swap-file 2. Run shareall(1M). 3. Have the client add the following line to /etc/vfstab: server:path-to-swap-file - local-path-to-swap-filenfs --- local-path-to-swap-file -- swap --- 4. Have the client run mount: # mount local-path-to-swap-file 5. The client can then run swap -a to add the swap space: # swap -a local-path-to-swap-file -d swapname Delete the specified swap area. This option can only be used by the super-user. swapname is the name of the swap file: for example, /dev/dsk/c0t0d0s1 or a regular file. swaplow is the offset in 512-byte blocks into the swap area to be deleted. If swaplow is not specified, the area will be deleted starting at the second page. When the command completes, swap blocks can no longer be allocated from this area and all swap blocks previously in use in this swap area have been moved to other swap areas. -l List the status of all the swap areas. The output has five columns: path The path name for the swap area. dev The major/minor device number in decimal if it is a block special device; zeroes otherwise. swaplo The swaplow value for the area in 512-byte blocks. blocks The swaplen value for the area in 512-byte blocks. free The number of 512-byte blocks in this area that are not currently allocated. The list does not include swap space in the form of physical memory because this space is not associated with a particular swap area. If swap -l is run while swapname is in the process of being deleted (by swap -d), the string INDEL will appear in a sixth column of the swap stats. -s Print summary information about total swap space usage and availability: allocated The total amount of swap space in bytes currently allocated for use as backing store. reserved The total amount of swap space in bytes not currently allocated, but claimed by memory mappings for possi- ble future use. used The total amount of swap space in bytes that is either allocated or reserved. available The total swap space in bytes that is currently available for future reservation and allocation. These numbers include swap space from all configured swap areas as listed by the -l option, as well swap space in the form of physical memory. USAGE
On the 32-bit operating system, only the first 2 Gbytes -1 are used for swap devices greater than or equal to 2 Gbytes in size. On the 64-bit operating system, a block device larger than 2 Gbytes can be fully utilized for swap up to 2**63 -1 bytes. ENVIRONMENT VARIABLES
See environ(5) for descriptions of the following environment variables that affect the execution of swap: LC_CTYPE and LC_MESSAGE. ATTRIBUTES
See attributes(5) for descriptions of the following attributes: +-----------------------------+-----------------------------+ | ATTRIBUTE TYPE | ATTRIBUTE VALUE | +-----------------------------+-----------------------------+ |Availability |SUNWcsu | +-----------------------------+-----------------------------+ SEE ALSO
pagesize(1), mkfile(1M), shareall(1M), getpagesize(3C), vfstab(4), attributes(5), largefile(5) WARNINGS
No check is done to determine if a swap area being added overlaps with an existing file system. SunOS 5.10 20 Jan 2004 swap(1M)

Featured Tech Videos

All times are GMT -4. The time now is 09:55 AM.
Unix & Linux Forums Content Copyright 1993-2020. All Rights Reserved.
Privacy Policy