Login or Register to Ask a Question and Join Our Community


Shell Programming and Scripting

Let statement

 
Thread Tools Search this Thread
Top Forums Shell Programming and Scripting Let statement
Prev   Next
# 1  
Old 01-27-2010
Let statement
I came across the following program:
Code:
if test $# = 3
then
	case $2 in
	 +) let z=$1+$3;;
	 -) let z=$1-$3;;
	 /) let z=$1/$3;;
	 x|X) let z=$1*$3;;
	 *) echo Warning - $2 invalied operator, only +,-,x,/ operator allowed
	    exit;;
	esac
	echo Answer is $z

What is the usage of let statement? I have never come across the same. Please let me know the usage, syntax and the need.

Instead of using the let statement above, we could have directly used
Code:
case $2 in
	 +)  z=$1+$3;;
	 -)  z=$1-$3;;
	 /)  z=$1/$3;;
	 x|X)  z=$1*$3;;

Then what is the need of using "let" here or anywhere else?
Last edited by Scott; 01-27-2010 at 09:05 PM.. Reason: Please use code tags
 
Login or Register to Ask a Question

Previous Thread | Next Thread

10 More Discussions You Might Find Interesting

1. Shell Programming and Scripting

Convert Update statement into Insert statement in UNIX using awk, sed....

Hi folks, I have a scenario to convert the update statements into insert statements using shell script (awk, sed...) or in database using regex. I have a bunch of update statements with all columns in a file which I need to convert into insert statements. UPDATE TABLE_A SET COL1=1 WHERE... (0 Replies)
Discussion started by: dev123
0 Replies

2. Shell Programming and Scripting

If statement

Hi, I have this code here. Its suppose to do something when certain condition is met, I'm pretty sure at least one of the condition will be meet somewhere in the loop but it always go to else part of the script. Is something wrong on this script? age_list=`tar -tvf /home/dir/$tarfile... (4 Replies)
Discussion started by: erin00
4 Replies

3. Shell Programming and Scripting

Statement

${PFILE}.backupfile Please tell me what the above statement means? (1 Reply)
Discussion started by: lg123
1 Replies

4. Shell Programming and Scripting

If statement help

I'm trying to create a script that would allow me to identify the sucessful removal of a file. Here's what i put together so far, let me know if it's correct or not. FILE_NAME="cactus.dat" FILE_FIND='find / -name $FILE_NAME' if ;then echo "cactus.dat was not removed successfully" ... (3 Replies)
Discussion started by: sdpinoy
3 Replies

5. UNIX for Dummies Questions & Answers

If statement (yes or no)

I have the program: #!/bin/ksh echo Please enter yes or no read n typeset -l n if ] then echo My name exit else echo delete my name fi Question: How can I make the program accept only the word "yes" or "no" otherwise it will ask the user to re-enter? Thanks! (7 Replies)
Discussion started by: bobo
7 Replies

6. Shell Programming and Scripting

How is use sselect statement o/p in insert statement.

Hi All, I am using Unix ksh script. I need to insert values to a table using the o/p from a slelect statement. Can anybody Help! My script looks like tihs. ---`sqlplus -s username/password@SID << EOF set heading off set feedback off set pages 0 insert into ${TB_NAME}_D... (2 Replies)
Discussion started by: nkosaraju
2 Replies

7. Shell Programming and Scripting

If statement - How to write a null statement

In my ksh script, if the conditions of a if statement are true, then do nothing; otherwise, execute some commands. How do I write the "do nothing" statement in the following example? Example: if (( "$x"="1" && "$y"="a" && "$z"="happy" )) then do nothing else command command fi... (3 Replies)
Discussion started by: april
3 Replies

8. Shell Programming and Scripting

statement

I want to write a program that would convert yard to feet and feet to yard. i.e 1 yard = 3 * feet Echo "enter a" read a expr a *3 The trick is that I want to give the user some options. After the conversion from yard to feet is done, I want to ask the user whether or not he/she wants to... (10 Replies)
Discussion started by: Ernst
10 Replies

9. Shell Programming and Scripting

if statement

can someone please tell me what is wrong with the below. i'm trying to get a script to run if the content of a variable is either small letter y or capital letter Y. if then whatever fi (4 Replies)
Discussion started by: Terrible
4 Replies

10. Shell Programming and Scripting

If statement

Hi, I have a statement in shell script which i am writing below: if ] then ..... What is the meaning of -a option in files, meaning of the statement in the if condition ] means. Thanks (3 Replies)
Discussion started by: dreams5617
3 Replies
Login or Register to Ask a Question

LEARN ABOUT DEBIAN

paps

PAPS(1) 						      General Commands Manual							   PAPS(1)

NAME

       paps - UTF-8 to PostScript converter using Pango

SYNOPSIS

       paps [options] files...

DESCRIPTION

       paps reads a UTF-8 encoded file and generates a PostScript language rendering of the file. The rendering is done by creating outline curves
       through the pango ft2 backend.

OPTIONS

       These programs follow the usual GNU command line syntax, with long options starting with  two  dashes  (`-').   A  summary  of  options	is
       included below.

       --landscape
	      Landscape output. Default is portrait.

       --columns=cl
	      Number of columns output. Default is 1.
	      Please notice this option isn't related to the terminal length as in a "80 culums terminal".

       --font=desc
	      Set the font description. Default is Monospace 12.

       --rtl  Do right to left (RTL) layout.

       --paper ps
	      Choose paper size. Known paper sizes are legal, letter and A4. Default is A4.

       Postscript points
	      Each postscript point equals to 1/72 of an inch. 36 points are 1/2 of an inch.

       --bottom-margin=bm
	      Set bottom margin. Default is 36 postscript points.

       --top-margin=tm
	      Set top margin. Default is 36 postscript points.

       --left-margin=lm
	      Set left margin. Default is 36 postscript points.

       --right-margin=rm
	      Set right margin. Default is 36 postscript points.

       --gutter-width=gw
	      Set gutter width. Default is 40 postscript points.

       --help Show summary of options.

       --header
	      Draw page header for each page.

       --markup
	      Interpret the text as pango markup.

       --lpi  Set the lines per inch. This determines the line spacing.

       --cpi  Set the characters per inch. This is an alternative method of specifying the font size.

       --stretch-chars
	      Indicates  that  characters  should be stretched in the y-direction to fill up their vertical space. This is similar to the texttops
	      behaviour.

AUTHOR

       paps was written by Dov Grobgeld <dov.grobgeld@gmail.com>.

       This manual page was written by Lior Kaplan <kaplan@debian.org>, for the Debian project (but may be used by others).

								  April  17, 2006							   PAPS(1)