need help in IF condition!!

Thread Tools Search this Thread
Top Forums Shell Programming and Scripting need help in IF condition!!
# 15  
Old 02-02-2009
test -s file66.txt || { mailx -s "file66.txt size zero" </dev/null; exit 99; }
echo "Shell Script Worked"

The braces are used when there are multiple commands you want to execute after || but you could also write this as an "if then else" if that's more convenient. Then it's easier to add commands, too.

if test -s file66.txt
    mailx -s "file66.txt size zero" </dev/null
    exit 99
echo "Shell script worked"

The braces and the semicolons are not necessary here, because everything up to "fi" (or "else") is executed when the condition matches. The || { stuff; } syntax is just basically a shorthand for when you want to cram stuff into a one-liner.
# 16  
Old 02-07-2009
Just need a quick info on this . if we need to break exit 1 or exit 0 will work instead of exit 99

# 17  
Old 02-08-2009
This should also work

test -s file66.txt && echo "Shell Script Worked" || exit 99


[ -s file66.txt ] && echo "Shell Script Worked" || exit 99

Last edited by ddreggors; 02-08-2009 at 01:00 AM..
# 18  
Old 02-09-2009
Thanks .. But just need to confirm whether exit 0 or exit 1 will work ..

I dont want to use exit 99 ..

Please let me know exit 0 or exit 1 will work instead of exit 99.

# 19  
Old 02-09-2009
"exit" will always exit, the number is the result code returned by the script from which you exited. An exit code of zero conventionally means "no error", any other number is treated as an error. This doesn't really matter if you are simply ignoring the exit code; but returning a meaningful exit code is useful so that you can use the script from another script.

if yourscripthere; then
  # your script did "exit" or "exit 0"
  # your script did "exit 1" or some other nonzero number
  # the precise number will be in $?

The maximum number is 255 (as per POSIX, etc).
Login or Register to Ask a Question

Previous Thread | Next Thread

10 More Discussions You Might Find Interesting

1. Shell Programming and Scripting

Help with if condition

o/p of my command is given below My requirement is if Pnumber is 0 then stabilization.Build.2013 else stabilization.PBuild.2013.3 (11 Replies)
Discussion started by: nikhil jain
11 Replies

2. UNIX for Dummies Questions & Answers

IF [ condition ] help

Hi all Unix newbie - please be gentle Am modifying an existing script to error trap a variable with a length of 0 #!/bin/bash ipfile='/var/data/bin/ipaddress' ] && ipold="$(< "$ipfile" )" ipnew="$( wget -q -O - | sed -e 's/.*Current IP Address: //;s/<.*$//' )" #... (6 Replies)
Discussion started by: CRChamberlain
6 Replies

3. Shell Programming and Scripting

If condition return 0 even when it fails to satisfy te condition

HI My doubt may be basic one but I need to get it clarified.. When i use "if" condition that checks for many AND, OR logical conditions like if ]; then return 0 fi Even the if condition fails it returns as zero.. Any clue.. But if i add else condition like if ]; ... (2 Replies)
Discussion started by: Priya Amaresh
2 Replies

4. Shell Programming and Scripting

if condition

if chr1:109457160 1 109457160 99.1735537190083 + chr1:109457233 1 109457233 99.1735537190083 - chr1:109457614 1 109457614 99.1735537190083 + chr1:109457618 1 109457618 100 + chr1:109457943 1 109457943 100 - chr1:109458224 1 109458224 99.1735537190083 - file1.txt If 6th column in... (3 Replies)
Discussion started by: johnkim0806
3 Replies

5. Shell Programming and Scripting

redirect stdout echo command in condition A run in condition B

hi, I have some problems in my simple script about the redirect echo stdout command inside a condition. Why is the echo command inside the elif still execute in the else command Here are my simple script After check on the two diff output the echo stdout redirect is present in two diff... (3 Replies)
Discussion started by: jao_madn
3 Replies

6. HP-UX

Difference between [condition] and [[condition]] and ((condition)) when used with if condition

Executed the following if conditions .. and got different results . only (( )) gave correct o/p with all scenarios . Can anybody please let me know what is the difference between and ] and ((condition)) when used with if condition. And why each condition gave different result. 1.... (2 Replies)
Discussion started by: soumyabubun
2 Replies

7. Shell Programming and Scripting

If Condition

Hi, I am trying to execute this command, but is it not working, says "`;' unexpected" eval $lgrep $SAM_CMD ; if ; then ; echo "No Error" ; fi What i want is, return the command output, if it is non zero, say "No Error". Thanks, John. (21 Replies)
Discussion started by: john_prince
21 Replies

8. Shell Programming and Scripting

if..else condition

i have a paramter data_date in which i am passing a string value.i want to find out another paramter file_date from this.the logic is given below if day of data_date = sunday or monday then file_date=data_date-1 else file_date=data_date-2 i am passing data_date as 20061027. how can i... (3 Replies)
Discussion started by: dr46014
3 Replies

9. Shell Programming and Scripting

if condition

Hi friends, :) In a shell script i found the following if condition. echo -n "Which version of $1 do you want to restore ('0' to quit)? : " read desired if ${desired:=1} -ge $index ] ; then echo "$0: Restore canceled by user: index value too big." >&2 exit 1 fi Can... (1 Reply)
Discussion started by: ravi raj kumar
1 Replies

10. Shell Programming and Scripting

if condition ...

i have following if condition if above statement is case sensitive.....what is syntax if i have to make above comparision case insensetive (4 Replies)
Discussion started by: mahabunta
4 Replies
Login or Register to Ask a Question

Featured Tech Videos