Sponsored Content
Top Forums Shell Programming and Scripting Missing Assigned Variable within logic operator Post 302403526 by karthigayan on Friday 12th of March 2010 10:07:57 PM
Old 03-12-2010
MySQL

To assign a command output to the variable you need to use the backtick(`).and also you should not give space while assign the output to a variable.

Code:
while :
do
echo "what's ur name? (if none just press [ENTER])"
read name
changeName=`echo $name | sed "s/on/ey/"`
echo $changeName  #this variable still can be read
if [ -z $name ]; then
 echo "you don't have a name goodbye"
 exit 0
else
 echo "your name will change from: $name to $changeName" #now changeName cannot be read why?
fi
done

 

9 More Discussions You Might Find Interesting

1. UNIX for Dummies Questions & Answers

What does $? mean when assigned to a variable?

If i write this statement in a Korn Shell script RCODE=$? what possibly does it eman? (3 Replies)
Discussion started by: ranjita.c
3 Replies

2. Shell Programming and Scripting

Check if a variable has a value assigned?

Hi, I want to check if a variable has a value assigned to it or not. I can do following - cat $Var > File1 if then echo "$Var has value" else echo "$Var is null" fi But I have to check for 3 Variables and I want to wrap it up in couple of unix statements. Any... (3 Replies)
Discussion started by: sumeet
3 Replies

3. Shell Programming and Scripting

unary operator is missing

hi , i m getting an error unary operator is missing. pls check why is this so? i=5 while test $i !=0 do echo $i i=`expr $i - 1` done (3 Replies)
Discussion started by: angel12345
3 Replies

4. Shell Programming and Scripting

[Bash] Variable won't get assigned value

I am making of a script that will go through a couple of for loops and create file names based on the values in that loop, however the variable that combines everything is not getting assigned properly: #! /bin/bash for imod in K33_j1b_WS9_6 do for emod in mb2A mb2C mb3A mb3C mb4A... (1 Reply)
Discussion started by: badinsults
1 Replies

5. Shell Programming and Scripting

How to use logic NOT operator for multiple AND conditions

Hi, my requirement is that my builds should not be built if the current hour is greater 3 but not (between 12 and 15), I'm trying to write a shell script for this but there is always an error hour=$1 echo "hour:$hour" if && ! && ]; then echo "exit" else echo "enter" fi ... (9 Replies)
Discussion started by: kgsrinivas
9 Replies

6. Shell Programming and Scripting

How to split a data assigned to a variable

The requirement is, there is a log file which contains a huge data. i need to get a particular field out of it by searching with another field. ex: 2011-03-28 13:00:07,423 : millis=231 q={ call get_data_account(?,?,?,?,?) }, params= i need to search for the word "get_data_account" in file... (1 Reply)
Discussion started by: Jassz
1 Replies

7. UNIX for Dummies Questions & Answers

How do you check if a variable has been assigned?

I am trying to check whether a variable has been assigned on the command line or not. Here is what I did: #!/usr/bin/bash if( $variable == '\0') { print "variable was not assigned" exit } else NF = 2 {print $1, ""} exit fi awk -f question1.awk variable = 58 letters.txt. So... (3 Replies)
Discussion started by: Fred63528
3 Replies

8. Shell Programming and Scripting

Perl multiple qr assigned to variable

Experts, I'm having problems with the code below. I'm trying to test $var2 for two different regexs. I thought it could be done per below, but I'm getting the following error when running. $ ./test.pl b fed50c0100**** Unescaped left brace in regex is deprecated, passed through in regex; marked... (2 Replies)
Discussion started by: timj123
2 Replies

9. Programming

Missing Logic Looping Through Switch Statement

Having trouble with the logic when looping over this switch case again: for (j = 0; data != 0; j++){ switch(data){ case 'c': output = ranit(r_brace_array); break; case 'h': output = ranit(pipe_array); break; ... (6 Replies)
Discussion started by: Azrael
6 Replies
echo(3XCURSES)						  X/Open Curses Library Functions					    echo(3XCURSES)

NAME
echo, noecho - enable/disable terminal echo SYNOPSIS
cc [ flag... ] file... -I /usr/xpg4/include -L /usr/xpg4/lib -R /usr/xpg4/lib -lcurses [ library... ] c89 [ flag... ] file... -lcurses [ library... ] #include <curses.h> int echo(void); int noecho(void); DESCRIPTION
The echo() function enables Echo mode for the current screen. The noecho() function disables Echo mode for the current screen. Initially, curses software echo mode is enabled and hardware echo mode of the tty driver is disabled. The echo() and noecho() functions control soft- ware echo only. Hardware echo must remain disabled for the duration of the application, else the behavior is undefined. RETURN VALUES
Upon successful completion, these functions return OK. Otherwise, they return ERR. ERRORS
No errors are defined. ATTRIBUTES
See attributes(5) for descriptions of the following attributes: +-----------------------------+-----------------------------+ | ATTRIBUTE TYPE | ATTRIBUTE VALUE | +-----------------------------+-----------------------------+ |Interface Stability |Standard | +-----------------------------+-----------------------------+ |MT-Level |Unsafe | +-----------------------------+-----------------------------+ SEE ALSO
getch(3XCURSES), getstr(3XCURSES), initscr(3XCURSES), libcurses(3XCURSES), scanw(3XCURSES), attributes(5), standards(5) SunOS 5.11 5 Jun 2002 echo(3XCURSES)
All times are GMT -4. The time now is 11:00 AM.
Unix & Linux Forums Content Copyright 1993-2022. All Rights Reserved.
Privacy Policy