BASH Grouping tests in IF statement Post: 302948318

Sponsored Content

Top Forums Shell Programming and Scripting BASH Grouping tests in IF statement Post 302948318 by Don Cragun on Sunday 28th of June 2015 08:19:03 PM

06-28-2015

Registered User

The correct syntax with test expr and [ expr ] for expressions performing numeric comparisons is -lt, -le, -eq, -ne, -gt, or -ge and for string comparisons is = and !=.

With [[ expr ]], the preferred operators for string and numeric comparisons are <, <=, ==, !=, >=, and >, but any of the forms used with test and [ ] can also be used. For [[ ]], = is deprecated and == is preferred.

Depending on what shell you're using, == may be accepted as a synonym for = in test and [ ], but == is not specified by the standards and does not work portably.

This User Gave Thanks to Don Cragun For This Post:

Don Cragun

View Public Profile for Don Cragun

Find all posts by Don Cragun

10 More Discussions You Might Find Interesting

1. Shell Programming and Scripting

Bash: evaluating $? variable (if statement)

Hello, i'm unable to write a correct if... statement to evaluate the $? variable. Could anybody send to me an example? for example, this lines of code didn't work... if ; then etc etc if ; then etc etc Thank you in advanced.

2. UNIX for Dummies Questions & Answers

Conditional statement in bash

I want to combine 2 conditional statements by using -o in bash, but it won't work. if ; then echo "The number needs to be between 0 and $nr" fi Each time i execute the file it says: ./selectCitaat: line 10: syntax error near unexpected token `$1'

3. Shell Programming and Scripting

"if" statement grouping

Hi I work in ksh88. I am trying to group a few conditional statements to check for the value of the variable DATE, but getting a syntax error: $DATE=1836 $] && ]] || ] && ]]; then ksh: syntax error: `]]]' unexpected is there a way to user "OR" between first part: if ] && ] and...

4. Shell Programming and Scripting

bash if statement help needed

Hi I need a script with an if statement that goes. I need it to search through all files within a directory with the extension .test if it finds the string '71502FSC1206' then do sed 's/71502FSC1206/\n&/g' > send.test If it finds the string '715MCH' or '715JAC' then I need it to move the...

5. UNIX for Dummies Questions & Answers

Bash - OR within an IF statement

Hey guys, Currently trying to write a wee script that runs only when logged in as one of two users. The rest of the script is working fine, but no matter what user I try to run it as, it always fails! This is the puzzling part:if ]; then echo "Run script as admin " exit 1 else...

6. UNIX for Dummies Questions & Answers

BASH Shell Scripting: If, Then Statement

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. Shell Programming and Scripting

BASH - case statement

Hi Gurus, I have the below BASH code which does not works for upper case alphabets except Z (upper case Z). What may be the reason. Also escape sequences like \n, \t, \b, \033(1m \033(0m (For bold letter) are not working. case $var in ) echo "Lower case alphabet" ;; ...

8. Shell Programming and Scripting

Bash - Nesting if statement in for loop

I have the basic command written in bash for element in 1 2 do if ]; then set el = "t" else set el = "p" fi done but i get the following error syntax error near unexpected token `for' ` for element in 1 2' What should i do differently?

9. Shell Programming and Scripting

[Solved] If statement in bash

I have the following code in bash, however "set red frmt" is not displayed. echo "iarg_rd = $iarg_rd" iarg_rd="2" if ; then echo "Hello World" fi if ; then frmt="${gap}${!frmt_titl_yl}" elif ; then frmt="${gap}${!frmt_titl_bk}" elif ; then echo...

10. UNIX for Dummies Questions & Answers

Bash statement equivalent

Hi all, i need a equivalent for the statement i run in bash, so it would also run in other shells. Specially i need it for ksh to run on AIX. Here the statements: exec > >(tee -a $log) exec 2> >(tee -a $log >&2) Thanks.

10 More Discussions You Might Find Interesting

1. Shell Programming and Scripting

Bash: evaluating $? variable (if statement)

Discussion started by: aristegui

2. UNIX for Dummies Questions & Answers

Conditional statement in bash

Discussion started by: doc.arne

3. Shell Programming and Scripting

"if" statement grouping

Discussion started by: aoussenko

4. Shell Programming and Scripting

bash if statement help needed

Discussion started by: firefox2k2

5. UNIX for Dummies Questions & Answers

Bash - OR within an IF statement

Discussion started by: jimbob01

6. UNIX for Dummies Questions & Answers

BASH Shell Scripting: If, Then Statement

Discussion started by: inkjoy00

7. Shell Programming and Scripting

BASH - case statement

Discussion started by: GaneshAnanth

8. Shell Programming and Scripting

Bash - Nesting if statement in for loop

Discussion started by: ncwxpanther

9. Shell Programming and Scripting

[Solved] If statement in bash

Discussion started by: kristinu

10. UNIX for Dummies Questions & Answers

Bash statement equivalent

Discussion started by: Kosak