Sponsored Content
Full Discussion: Bash arithmetic issue
Top Forums Shell Programming and Scripting Bash arithmetic issue Post 302977812 by RudiC on Friday 22nd of July 2016 08:06:26 AM
Old 07-22-2016
This is specified and expected behaviour. man bash:
Quote:
If the value of the expression is non-zero, the return status is 0; otherwise the return status is 1.
A++ is post-increment, i.e. A is evaluated (to zero, thus return status 1) and then incremented. ++A will return the expected 0 .
These 3 Users Gave Thanks to RudiC For This Post:
 

10 More Discussions You Might Find Interesting

1. Shell Programming and Scripting

Need help is manipulating a file with some arithmetic operations using bash script

Friends, I have a file with contents like: interface Serial0/4/0/0/1/1/1/1:0 encapsulation mfr multilink group 101 Now I need to manipulate the file in such a way that to all the numbers less than 163, 63 gets added and to all numbers greater than 163, 63 gets deducted.(The numbers... (2 Replies)
Discussion started by: shrijith1
2 Replies

2. Shell Programming and Scripting

Bash Calculator issue

Hello, I'm relatively new to using bc so I could use some help. In this script im working on I want to have the bc function to calculate float numbers for imagemagicks convert charcoal. Below is what I'm talking about. There are no syntax errors but when it outputs the users frames for example 0-10... (2 Replies)
Discussion started by: jsells20
2 Replies

3. Shell Programming and Scripting

Arithmetic operations in bash,ksh,sh

Guys, The below expression is valid in which shells (sh,ksh,bash,csh)? VAR1=2 VAR2=$(($VAR1 -2)) Thanks (1 Reply)
Discussion started by: rprajendran
1 Replies

4. Shell Programming and Scripting

bash in perl issue

I use the following shell script in bash and it works fine. It returns 1 # cat /etc/httpd/conf/res.txt maldet(24444): {scan} scan completed on eicar_com.zip: files 1, malware hits 1, cleaned hits 0 # if ]; then echo 0 > /etc/httpd/conf/malflag; else echo 1 > /etc/httpd/conf/malflag;... (2 Replies)
Discussion started by: anilcliff
2 Replies

5. Shell Programming and Scripting

bash ls command file issue

ls -l /md01/EL/MarketData/inbound/ststr/INVENTORY* |tail -5 |awk '{ print $5,$6,$7,$8,$9 }'If I run the above from the command line the output to md_email is formatted correctly as 78213497 May 1 12:50 /md01/EL/MarketData/inbound/ststr/INVENTORY.20120430.PINESTREET.CSV.done 77904740 May 2... (3 Replies)
Discussion started by: smenago
3 Replies

6. Shell Programming and Scripting

Arithmetic calculations in bash file

I have 2 numbers xmin = 0.369000018 xmax = 0.569000006 and want to calculate (xmax- xmin) / 5.0 I have tried using $(( )) but is always giving an error (8 Replies)
Discussion started by: kristinu
8 Replies

7. Shell Programming and Scripting

Array Issue In Bash

Hi, I have the following code which is giving error mentioned below. Please can you support on this. Also suggest how can we access all the items against single vasservicename in circlename array,i.e, vasservicename say MTSTV will be available to all circles which are mentioned in the array... (2 Replies)
Discussion started by: siramitsharma
2 Replies

8. Shell Programming and Scripting

Arithmetic on a Float in bash

I am using bash I have a script that takes a number, i.e. 85.152, which is always a non integer and essentially tries to get that number to be a multiple of 10. My code is as follows: number=85.152 A=${number%.*} #Converts float to integer typeset -i B=$(((A-20)/10)) #subtracting 20 is... (12 Replies)
Discussion started by: prodigious8
12 Replies

9. UNIX for Beginners Questions & Answers

Compare bash arrays issue

Hello everyone, I need help comparing 2 arrays. the first array is static; the second array is not .. array1=( "macOS Mojave" "iTunes" ) cd /Volumes array2=( * ) # output of array2 macOS Mojave iTunes Mac me The problem occurs when I compare the arrays with the following code - ... (6 Replies)
Discussion started by: trexthurman
6 Replies

10. Shell Programming and Scripting

Arithmetic with bash

I need to divide the number of white spaces by total number of characters in a file using bash. I am able to get the number of white spaces correctly using: tr -cd < afile | wc -c I am also able to get the total number of characters using: wc -c afile How do I divide the first... (2 Replies)
Discussion started by: ngabrani
2 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)
All times are GMT -4. The time now is 06:38 PM.
Unix & Linux Forums Content Copyright 1993-2022. All Rights Reserved.
Privacy Policy