|
|
Sponsored Content
Homework and Emergencies
Homework & Coursework Questions
Help with bash shell scripting
Post 302513245 by Perderabo on Tuesday 12th of April 2011 04:17:05 PM
04-12-2011
Quote:
You also missed my point about k vs $k inside (( )). ((k=k+3)) works, (($k=$k+3)) does not since K gets substituted before anything starts calculating, so you end up trying to assign the value of 3 or something. Just plain variable names don't ever need a $ inside a (( )) expression anyway, why make them more complicated?
Code:
$ $ $ a="2+2" $ b="3+3" $ ((c = a * b )) ; echo $c 24 $ ((c = $a * $b )) ; echo $c 11 $
Code:
$ cat getn #! /usr/bin/ksh printf "Enter a number - " read number printf "you entered %d \n" $number exit 0 $ $ $ ./getn Enter a number - 77 you entered 77 $
|
|
10 More Discussions You Might Find Interesting
1. Shell Programming and Scripting
Hi,
i am new to UNIX. I have couple of basic questions.
1. Is the syntax for BASH shell programming same in the LINUX and SUN SOLARIS operating systems?
2. I have to work on BASH shell programming in SUN SOLARIS operating system. I am going through the documentation from the following... (4 Replies)
Discussion started by: azazalis
4 Replies
2. Shell Programming and Scripting
Can any1 please help me...
i'm really lost in using bash shell scripting...
and i got to hand this up on monday...
please anyone teach me how to do this assignment...
Please use basic things because i just learn the program only... thanks
... (1 Reply)
Discussion started by: Fr0z3n999
1 Replies
3. Shell Programming and Scripting
wwww wwwwwwww wwwwwwwwwwwww (0 Replies)
Discussion started by: keyvan
0 Replies
4. Shell Programming and Scripting
Hi,
Actually i have written one test.sh (shell program) in bash.
Here i have a variables $a which stored the value package1.
Now I want to write a regular expression inside the if command that "if $a variable contains letter p in the begining of the value package1 then it is coming true.... (5 Replies)
Discussion started by: sunitachoudhury
5 Replies
5. Shell Programming and Scripting
Hi all,
Can anyone guide to get tricks for file handling in bash shell? Thanks in advance.
Thanks
Deepak (2 Replies)
Discussion started by: naw_deepak
2 Replies
6. Shell Programming and Scripting
#! /bin/sh
abcd = "Hello world"
if
then
echo $abcd
fi
i got error message that
line3 : abcd: command not found
line5 : [0: command not found
line5 : [1: command not found
i have no idea why i got this message. Can some one help me ??? (6 Replies)
Discussion started by: bonosungho
6 Replies
7. UNIX for Dummies Questions & Answers
i am new to shell scripting and stuck at one place in my program.
i am reading data from one structured file and extracting some data from particular lines and then writing into the output file. In that reading input file line by line from while loop.
while read line
do
rectype=line... (7 Replies)
Discussion started by: reeta_shri
7 Replies
8. Shell Programming and Scripting
Hello All,
I am setting up a cron job, where i am calling a shell script to make few builds. I got struck at a point, need some expert inputs to proceed further.
The script is categorized in 5 parts and in the last part while building software it asks for few questions like:-
1. Build mode... (4 Replies)
Discussion started by: sahil_jammu
4 Replies
9. UNIX for Dummies Questions & Answers
I'm having trouble trying to create a BASH shell script.
I want the user to input a command "cat file_name.c" and then the shell script will delete all comments "/* */" from file_name.c else exit.
So far I have this:
#!/bin/bash
read "cat file" // User will input command cat... (7 Replies)
Discussion started by: inkjoy00
7 Replies
10. UNIX for Dummies Questions & Answers
I do not know shell scripting. But at work place, I have got an in and out shell scripting task. I just need to understand a very big script. Is there any tool in which I can place the script and it can tell me the meaning of the whole script? (3 Replies)
Discussion started by: lg123
3 Replies
LEARN ABOUT SUNOS
shells
shells(4) File Formats shells(4) NAME
shells - shell database SYNOPSIS
/etc/shells DESCRIPTION
The shells file contains a list of the shells on the system. Applications use this file to determine whether a shell is valid. See getuser- shell(3C). For each shell a single line should be present, consisting of the shell's path, relative to root. A hash mark (#) indicates the beginning of a comment; subsequent characters up to the end of the line are not interpreted by the routines which search the file. Blank lines are also ignored. The following default shells are used by utilities: /bin/bash, /bin/csh, /bin/jsh, /bin/ksh, /bin/pfcsh, /bin/pfksh, /bin/pfsh, /bin/sh, /bin/tcsh, /bin/zsh, /sbin/jsh, /sbin/sh, /usr/bin/bash, /usr/bin/csh, /usr/bin/jsh, /usr/bin/ksh, /usr/bin/pfcsh, /usr/bin/pfksh, /usr/bin/pfsh, and /usr/bin/sh, /usr/bin/tcsh, /usr/bin/zsh. Note that /etc/shells overrides the default list. Invalid shells in /etc/shells may cause unexpected behavior (such as being unable to log in by way of ftp(1)). FILES
/etc/shells lists shells on system SEE ALSO
vipw(1B), ftpd(1M), sendmail(1M), getusershell(3C), aliases(4) SunOS 5.10 4 Jun 2001 shells(4)