Sponsored Content
Top Forums Shell Programming and Scripting Problem in using AND OR condition together Post 302346094 by methyl on Friday 21st of August 2009 03:33:56 AM
Old 08-21-2009
Mine and franklin52 solutions look similar but are actually very different.

franklin52 is using a "regular expression" - see "man 5 regexp" (and "man" for your shell) within a sub-shell (enclosed by parentheses) and testing the success or failure with the "&&" operative before using a "test" for the right hand side of the and.

I am just using a "test" - see "man 1 test" (and "man" for your shell) with parentheses overriding the default execution order of the ands and ors. Similar to a mathematical function. The parentheses are escaped so they will be passed to "test" rather than being actioned by the shell.


Thus the use of parentheses is totally different syntax, but the use of single square brackets to enclose a condition is similar.
 

9 More Discussions You Might Find Interesting

1. Shell Programming and Scripting

If condition problem

Hi Guys, I want to use if conition for my script. Before I used it tried it with some small test scripts. But it was not succeeded. My script and screen output as follows, Script: echo 'Do you think Yes or No (y/n) : ' read ans echo You input anser as $ans ans1=y if ( $ans == $ans1... (5 Replies)
Discussion started by: maheshsri
5 Replies

2. Shell Programming and Scripting

problem with if condition

hi, :) pls consider the following if statement if //g') ] then ........ else ....... when i execute the script i am getting the following error '(' unexpected I am not able to find the mistake. could anybody tell where i did mistake. cheers RRK (13 Replies)
Discussion started by: ravi raj kumar
13 Replies

3. Shell Programming and Scripting

problem in if condition

hi, actully i need the belp for the below. host_list=" Host1 host2 host3 host4 " n=`hostname` i need to put the condition like the below if n is among the host mention in the host_list if then #some stugg else # some other stuff fi (1 Reply)
Discussion started by: mail2sant
1 Replies

4. Shell Programming and Scripting

problem in if then else condition

Hi , I am trying the following simple script . But it is always giving 1 output. Dont know why #!/bin/sh find . -name "a.log" if ; then echo "1" else echo "0" fi Kindly advice. it is giving 1 output even when the a.log file is not there (26 Replies)
Discussion started by: himvat
26 Replies

5. Shell Programming and Scripting

Problem in if condition

Hi all, I have task to delete two different files from all file system. one is core file & other is old file. i can delete core file but for old file i have to mv in different location. i wrote a script but it is not working. i have a two variables in this script first one is delcnt &... (6 Replies)
Discussion started by: dravi_laxmi
6 Replies

6. Shell Programming and Scripting

If condition problem

Hi, I need to use if condition for search a file pattern on a particular location. cd $file_Path if || then do this else do that fi Can someone help me with the if part, how i can put those conditions? make sure format should be *.file* and *.file file is a keyword which i... (5 Replies)
Discussion started by: amit.mathur08
5 Replies

7. Shell Programming and Scripting

Problem with IF condition .

Hi i am writing a script where i am running , 5 scripts together in 1 script . Now what i want is when these 5 scripts run completely , i should execute some other commands like i have compile the data etc. I have have 5 echo statements at the end of all those scripts . Like echo "1 is done" in... (1 Reply)
Discussion started by: honey26
1 Replies

8. Shell Programming and Scripting

If condition problem

Hi All, I am using below if condition to check whether null is passed as a parameter to the program if or ; then echo "ABC">>$FILE else echo "CDF">>$FILE fi However it is saying me null=null command not found . Please help me with this (9 Replies)
Discussion started by: Hypesslearner
9 Replies

9. Shell Programming and Scripting

Condition problem

Hi All, Seeking for your assistance on how to condition it correctly. cat file1.txt 290,1663,43,888,0,0.00,86.91,0.00,26.98,0.00 290,1663,52,0,0,0.00,0.00,0.00,0.00,0.00 290,1663,52,888,0,0.00,34.60,0.00,9.00,0.00 1st scenario: if the fourth column contains 888s and 0s it is by... (16 Replies)
Discussion started by: znesotomayor
16 Replies
test(1F)							   FMLI Commands							  test(1F)

NAME
test - condition evaluation command SYNOPSIS
test expression expression DESCRIPTION
test evaluates the expression expression and if its value is true, sets a 0 (TRUE) exit status; otherwise, a non-zero (FALSE) exit status is set; test also sets a non-zero exit status if there are no arguments. When permissions are tested, the effective user ID of the process is used. All operators, flags, and brackets (brackets used as shown in the second SYNOPSIS line) must be separate arguments to test. Normally these items are separated by spaces. USAGE
Primitives The following primitives are used to construct expression: -r filename True if filename exists and is readable. -w filename True if filename exists and is writable. -x filename True if filename exists and is executable. -f filename True if filename exists and is a regular file. -d filename True if filename exists and is a directory. -c filename True if filename exists and is a character special file. -b filename True if filename exists and is a block special file. -p filename True if filename exists and is a named pipe (FIFO). -u filename True if filename exists and its set-user-ID bit is set. -g filename True if filename exists and its set-group-ID bit is set. -k filename True if filename exists and its sticky bit is set. -s filename True if filename exists and has a size greater than 0. -t[fildes] True if the open file whose file descriptor number is fildes (1 by default) is associated with a terminal device. -z s1 True if the length of string s1 is 0. -n s1 True if the length of the string s1 is non-zero. s1 = s2 True if strings s1 and s2 are identical. s1 != s2 True if strings s1 and s2 are not identical. s1 True if s1 is not the null string. n1 -eq n2 True if the integers n1 and n2 are algebraically equal. Any of the comparisons -ne, -gt, -ge, -lt, and -le may be used in place of -eq. Operators These primaries may be combined with the following operators: ! Unary negation operator. -a Binary and operator. -o Binary or operator (-a has higher precedence than -o). `(expression)` Parentheses for grouping. Notice also that parentheses are meaningful to the shell and, therefore, must be quoted. ATTRIBUTES
See attributes(5) for descriptions of the following attributes: +-----------------------------+-----------------------------+ | ATTRIBUTE TYPE | ATTRIBUTE VALUE | +-----------------------------+-----------------------------+ |Availability |SUNWcsu | +-----------------------------+-----------------------------+ SEE ALSO
find(1), sh(1), attributes(5) NOTES
If you test a file you own (the -r , -w , or -x tests), but the permission tested does not have the owner bit set, a non-zero (false) exit status will be returned even though the file may have the group or other bit set for that permission. The correct exit status will be set if you are super-user. The = and != operators have a higher precedence than the -r through -n operators, and = and != always expect arguments; therefore, = and != cannot be used with the -r through -n operators. If more than one argument follows the -r through -n operators, only the first argument is examined; the others are ignored, unless a -a or a -o is the second argument. SunOS 5.11 5 Jul 1990 test(1F)
All times are GMT -4. The time now is 11:27 AM.
Unix & Linux Forums Content Copyright 1993-2022. All Rights Reserved.
Privacy Policy