Using boolean expression Bash script Post: 302966246

10 More Discussions You Might Find Interesting

1. Shell Programming and Scripting

Regular expression boolean in perl

How can I find out, that whether a regular expression are matched or not(as a boolean)?! tnx in advance.

2. Shell Programming and Scripting

[Bash]Function returning a boolean

Hello all, I would like to know if it is possible to return a the result of a boolean expression from a function like this function() { # some code return || } and what will be the return value ? Thank you for help.

3. Shell Programming and Scripting

Boolean expression issues

Hi everybody: I'm working on a script to send emails with logs attached based on one single rule..."check if the number of errors has increased since the last time the script ran" Basically what my script does is read from a previous file with the last trace of errors the previous error...

4. Shell Programming and Scripting

boolean expression in bash

Can someone, please, help me to make this condition valid/accepted in bash? I really cannot. I'm stuck with the brackets... This one tells me: missing `]' if ]; then # NOTIFY ERROR... fi And... I'd also appreciate a link to bash documents that explain these things. All...

5. UNIX for Dummies Questions & Answers

Im new to bash scriping and i found this expression on a bash script what does this mean.

# check host value regex='^(||1|2|25)(\.(||1|2|25)){3}$' if ')" != "" ]; then if ]; then echo host $host not found exit 4 fi elif ]; then echo $host is an invalid host address exit 5 fi espeacailly the top regex part? ---------- Post updated at 06:58 PM ---------- Previous update was...

6. Shell Programming and Scripting

Hi im new to bash scripting I want to know what does the regex expression do ??

# check host value regex='^(||1|2|25)(\.(||1|2|25)){3}$' if ')" != "" ]; then if ]; then echo host $host not found exit 4 fi elif ]; then echo $host is an invalid host address exit 5 fi

7. Shell Programming and Scripting

Boolean expression

hi, im learning python language. and my teacher gives me this question on class: Boolean expression : not (p or not q) what is the correct answer for that? i still dont understand, and please give me a link for a new beginner in python to learn. thanks

8. Shell Programming and Scripting

Getting error in bash script; expr $a + 1: integer expression expected

Hi, I am new to shell/bash script. I am trying to run below script #!/bin/bash a=0 b=10 if then echo "a is equal to be" else echo "a is not equal to be" fi MAX=10 while do echo $a a='expr $a + 1' done

9. Shell Programming and Scripting

How to assign result of boolean expression?

Hello I would to write the test on one line like : declare -i x=0 y=0 ........ some code assign value 0 or 1 to x and y ........ # if either x or y or both is set to 1, then do something if -o ; then do_something fi Any help is welcome

10. UNIX for Beginners Questions & Answers

How to write a Boolean variable which succeed and failed inside the if loop in shell script ?

I have if loop with multiple variable value check in if loop. How can i print only if loop satisfied variable and its value in shell script ? I dont want to check each variable in if loop. That makes my script larger. if ] then echo "Only satisfied variable with value" ...

LEARN ABOUT OSF1

script

script(1)						      General Commands Manual							 script(1)

NAME

       script - Makes a transcript of terminal session

SYNOPSIS

       script [-a] [file]

       The script command makes a transcript of everything printed on your terminal.

OPTIONS

       Appends the transcript to file rather than writing it to file.

OPERANDS

       The name of an output file that will contain the transcript of the session.  If this parameter is omitted, the file typescript is written.

DESCRIPTION

       The transcript is written to file, or appended to file if the -a option is given.  If no file name is given, the transcript is saved in the
       file typescript.

       The script ends when the forked shell exits.

       This program is useful when you are using a CRT and want a hard-copy record of the dialog (for example, a technical writer might create	an
       example of a working session this way).

       If you specify the -a option and the file does not exist, it is created.

       If you do not specify the -a option and the file exists, it is replaced.

RESTRICTIONS

       The  script command requires a streams based terminal.  In single user mode, streams may not be enabled.  Under these circumstances, script
       will exit with no action.  If you are the superuser and need to run this command in single user mode, use the  following  special  instruc-
       tions.

   Enabling Streams
       If it is necessary to enable a streams environment in the single user mode, enter the command /sbin/init.d/streams.  This command is avail-
       able to the superuser only.

SEE ALSO

       Commands:  autopush(8), cat(1), echo(1), strsetup(8), tee(1)

       System Administration

																	 script(1)