Sponsored Content
Top Forums UNIX for Beginners Questions & Answers Shell Script behaviour and syntax Post 303045824 by Cybora on Tuesday 14th of April 2020 08:36:00 AM
Old 04-14-2020
For Chuber:
1. In StartProcess.sh you only set an environment variable and echo a couple of messages. $! is supposed to be the PID of the last command run in the background, but nothing is being run in the background.
I removed a line of code to post here. It actually calls a process /opt/$[folderpath}/bin/java ${JAVA_OPTIONS} WregProcessor.jar > /dev/null 2>&1 &

2. So are you saying that if you type ./FirstScrpt.sh & that the prompt doesn't return and the script has to be killed (or CTRL-C) to get control back to your invoking shell? Yes

For Sea: the code is below is typed 2 times is this how it should be ?

Code:
echo $!
( echo $! ) &
echo $!
( echo $! ) &
echo $!

 

10 More Discussions You Might Find Interesting

1. Shell Programming and Scripting

any explanation for thsi shell script behaviour

hello whats the difference between excuting a shell script as a)sh myscript.sh b). ./myscript.sh i noticed that my shell script works fine when i run it as . ./myscript .sh but fails when i run it as sh myscript.sh could anybody explain why. the shell script is very simple ... (9 Replies)
Discussion started by: xiamin
9 Replies

2. Shell Programming and Scripting

Shell script syntax checker

I have a rather big script that i have written in ksh and it is falling over in two places with a 'test argument' error. I know this usually means that the if statement is not correct, but it is fine. I have looked through the rest of the script for any odd brackets or ` marks, but can't see... (2 Replies)
Discussion started by: handak9
2 Replies

3. Shell Programming and Scripting

Basic Shell script syntax help

Hi All, I am new to shell scripting. I have a variable which holds a numeric value.I have to check whether this variable holds a value between(0- 8),(8-17)(17-24).How do i write this syntax using if in shell scripting. Thanks Vignesh (2 Replies)
Discussion started by: vignesh53
2 Replies

4. Shell Programming and Scripting

How to Check Shell script syntax w/o executing

Hello All, I looking for a way to verify the correction of shell script syntax. Is there any switch like -c in perl which do this in shell ? Thank You. (1 Reply)
Discussion started by: Alalush
1 Replies

5. Shell Programming and Scripting

Help Syntax Shell-Script

Hi Guys, iīve a question ... but itīs a litte bit tricky: iīve a 3 php-scripts which runīs via cron at night. These script reads an xml-file a writes it in an MySQL-DB. I named them (for example here ) Script1 - Script3. The XML-Files i named xml1 - xml3. Now, iīve build a Batch-file,... (10 Replies)
Discussion started by: jackcracker
10 Replies

6. Shell Programming and Scripting

Syntax error calling TCL script from shell script

hello everyone i am beginner on shell scripting .and i am working on my project work on ad hoc network i wrote a batch (.sh) to do a looping and execute a tcl script i wrote before in each iteration ..but i got this problem " syntax error near unexpected token `('... (1 Reply)
Discussion started by: marcoss90
1 Replies

7. Shell Programming and Scripting

shell script | bc syntax format

sorry but need help http://i.investopedia.com/inv/articles/site/CalculationEMA.gif trying to achieve ema in script I have this syntax which errors ema=` ; the 0.153846154 ='s Smoothing Factor really appreciate help (3 Replies)
Discussion started by: harte
3 Replies

8. Shell Programming and Scripting

syntax error in shell script

I am creating a shell script. In which, I need to get server name and server IP. I used this command in script. servername=`cat /etc/hosts|grep `eval hostname`|awk '{print $2}'` however, when execute script or put set -x to debug, it return: line 13: syntax error at line 13: `|' unexpected... (4 Replies)
Discussion started by: duke0001
4 Replies

9. Shell Programming and Scripting

Bash syntax behaviour : [[ vs [

Hello. In the following : RESTORE_FF contain a file name : a_file.tar.gz I am testing in a directory if "a_file.tar.gz" exists and or if any file like "a_file.tar.gz" exists. So "a_file.tar.gz" will give me file exists So "a_file.tar.gz." will give me file exists So... (5 Replies)
Discussion started by: jcdole
5 Replies

10. Shell Programming and Scripting

Help with if statement syntax in shell script

I want to make the file test condition a variable ($Prmshn in code below). My goal is to use something like the first three unsuccessful if statetments since the 'if #!/bin/ksh test_input() { Prmshn=${1} InFLNm=${2} ifReq="-$Prmshn $InFLNm" #the following three if statments fail: #if ] ;... (10 Replies)
Discussion started by: ms63707
10 Replies
INTVAL(3)								 1								 INTVAL(3)

intval - Get the integer value of a variable

SYNOPSIS
int intval (mixed $var, [int $base = 10]) DESCRIPTION
Returns the integer value of $var, using the specified $base for the conversion (the default is base 10). intval(3) should not be used on objects, as doing so will emit an E_NOTICE level error and return 1. PARAMETERS
o $var - The scalar value being converted to an integer o $base - The base for the conversion Note If $base is 0, the base used is determined by the format of $var: o if string includes a "0x" (or "0X") prefix, the base is taken as 16 (hex); otherwise, o if string starts with "0", the base is taken as 8 (octal); otherwise, o the base is taken as 10 (decimal). RETURN VALUES
The integer value of $var on success, or 0 on failure. Empty arrays return 0, non-empty arrays return 1. The maximum value depends on the system. 32 bit systems have a maximum signed integer range of -2147483648 to 2147483647. So for example on such a system, intval('1000000000000') will return 2147483647. The maximum signed integer value for 64 bit systems is 9223372036854775807. Strings will most likely return 0 although this depends on the leftmost characters of the string. The common rules of integer casting apply. EXAMPLES
Example #1 intval(3) examples The following examples are based on a 32 bit system. <?php echo intval(42); // 42 echo intval(4.2); // 4 echo intval('42'); // 42 echo intval('+42'); // 42 echo intval('-42'); // -42 echo intval(042); // 34 echo intval('042'); // 42 echo intval(1e10); // 1410065408 echo intval('1e10'); // 1 echo intval(0x1A); // 26 echo intval(42000000); // 42000000 echo intval(420000000000000000000); // 0 echo intval('420000000000000000000'); // 2147483647 echo intval(42, 8); // 42 echo intval('42', 8); // 34 echo intval(array()); // 0 echo intval(array('foo', 'bar')); // 1 ?> NOTES
Note The $base parameter has no effect unless the $var parameter is a string. CHANGELOG
+--------+---------------------------------------------------+ |Version | | | | | | | Description | | | | +--------+---------------------------------------------------+ | 5.1.0 | | | | | | | Throws E_NOTICE and returns 1, when an object is | | | passed to $var. | | | | +--------+---------------------------------------------------+ SEE ALSO
boolval(3), floatval(3), strval(3), settype(3), is_numeric(3), Type juggling, BCMath Arbitrary Precision Mathematics Functions. PHP Documentation Group INTVAL(3)
All times are GMT -4. The time now is 10:45 AM.
Unix & Linux Forums Content Copyright 1993-2022. All Rights Reserved.
Privacy Policy