Conditional variables

Tags

shell scripts

Top Forums Shell Programming and Scripting Conditional variables

10-04-2010

Registered User

81, 1

Join Date: Sep 2010

Last Activity: 18 May 2015, 5:41 AM EDT

Posts: 81

Thanks Given: 18

Thanked 1 Time in 1 Post

Conditional variables

if {-a file}
if {-s file} what it will do

if {-z string} what it will do

please help on this

thelakbe

View Public Profile for thelakbe

Find all posts by thelakbe

10-04-2010

Registered User

1,690, 205

Join Date: Jun 2007

Last Activity: 13 July 2020, 5:35 PM EDT

Location: Mumbai, India

Posts: 1,690

Thanks Given: 139

Thanked 205 Times in 199 Posts

These are conditional expressions, which returns true or false on evaluating something for what they have defined. you would have square brackets instead of curly.

Code:

man test

for details.

Code:

      -a file
           True if file exists.
      -s file
           True if file exists and has a size greater than zero.
      -z s1
           True if the length of string s1 is zero.

clx

View Public Profile for clx

Find all posts by clx

Previous Thread | Next Thread

10 More Discussions You Might Find Interesting

1. Shell Programming and Scripting

Passing awk variables to bash variables

Trying to do so echo "111:222:333" |awk -F: '{system("export TESTO=" $2)}'But it doesn't work

2. Shell Programming and Scripting

Running a script with multiple variables like 25 variables.

Hi All, i have a requirement where i have to run a script with at least 25 arguements and position of arguements can also change. the unapropriate way is like below. can we achieve this in more good and precise way?? #!/bin/ksh ##script is sample.ksh age=$1 gender=$2 class=$3 . . ....

3. Shell Programming and Scripting

Conditional execution

Here's an interesting (to me, anyway) little puzzle. Background: I have a process that restores a number of large(ish) files from tape backup. As an individual file is being written, it is owned by root, then the ownership is changed when that file is complete. Since this process can take...

4. Shell Programming and Scripting

Conditional Splitting.

hi, I have file with some data delimited by #. For e.g. : RHMS0001#1#ABCD RHMS0002#1#ABCD RHMS0003#1#ABCD RHMS0004#1#ABCD RHMS0005#1#ABCD RHMS0006#1#ABCD RHMS0007#1#ABCD RHMS0001#2#ABCD RHMS0002#2#ABCD RHMS0001#3#ABCD RHMS0004#3#ABCD RHMS0006#3#ABCD

5. UNIX for Advanced & Expert Users

Pthreads-Conditional variables

Hello, consider a bunch of threads which want to execute a while loop in parallel but after each iteration of while loop, we need a synchornization.That is, we have a global count varibale which is equal to zero at beginig of each iteration and at the end of each iterartion this variable...

6. Shell Programming and Scripting

If conditional

Hi, I am new to unix and shell scripting.In my script,there is a line using the "if" conditional - if && ; then do something Here "x" is a variable holding string value.If it is not equal to a comma or a string,only then I want to enter the "if" loop. But I am getting error while...

7. UNIX for Dummies Questions & Answers

If conditional

8. UNIX for Dummies Questions & Answers

conditional

conditional is not wworking can any one figure out what goes wrong xx1=`$ORACLE_HOME/bin/sqlplus -s apps/ostgapps1 2>/dev/null << EOF WHENEVER SQLERROR EXIT 1 set head off feedback off ; WHENEVER SQLERROR EXIT SQL.SQLCODE; select count(*) from CMS_INVOICE_ALL...

9. Programming

How to convert byteArray variables to HexaString variables for Linux?

Hello everybody, I am having problem in converting byte array variables to Hexa String variables for Linux. I have done, converting byte array variables to Hexa String variables for Windows but same function doesn't work for linux. Is there any difference in OS ? The code for Windows is given...

10. Shell Programming and Scripting

AWK - conditional cause

Hello guys, I want to make a conditional cause in the following file using awk: awk '{ if ($2 != 0) print $1, $2, $3}' test.csv > test2.csv FILE EXAMPLE = test.csv string,number,date abc,0,20050101 def,1,20060101 ghi,2,20040101 jkl,12,20090101 mno,123,20020101 ...

Shell Programming and Scripting