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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 $!

 

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echo(1B)					     SunOS/BSD Compatibility Package Commands						  echo(1B)

NAME
echo - echo arguments to standard output SYNOPSIS
/usr/ucb/echo [-n] [argument] DESCRIPTION
echo writes its arguments, separated by BLANKs and terminated by a NEWLINE, to the standard output. echo is useful for producing diagnostics in command files and for sending known data into a pipe, and for displaying the contents of envi- ronment variables. For example, you can use echo to determine how many subdirectories below the root directory (/) is your current directory, as follows: o echo your current-working-directory's full pathname o pipe the output through tr to translate the path's embedded slash-characters into space-characters o pipe that output through wc -w for a count of the names in your path. example% /usr/bin/echo "echo $PWD | tr '/' ' ' | wc -w" See tr(1) and wc(1) for their functionality. The shells csh(1), ksh(1), and sh(1), each have an echo built-in command, which, by default, will have precedence, and will be invoked if the user calls echo without a full pathname. /usr/ucb/echo and csh's echo() have an -n option, but do not understand back-slashed escape characters. sh's echo(), ksh's echo(), and /usr/bin/echo, on the other hand, understand the black-slashed escape characters, and ksh's echo() also understands a as the audible bell character; however, these commands do not have an -n option. OPTIONS
-n Do not add the NEWLINE to the output. ATTRIBUTES
See attributes(5) for descriptions of the following attributes: +-----------------------------+-----------------------------+ | ATTRIBUTE TYPE | ATTRIBUTE VALUE | +-----------------------------+-----------------------------+ |Availability |SUNWscpu | +-----------------------------+-----------------------------+ SEE ALSO
csh(1), echo(1), ksh(1), sh(1), tr(1), wc(1), attributes(5) NOTES
The -n option is a transition aid for BSD applications, and may not be supported in future releases. SunOS 5.10 3 Aug 1994 echo(1B)
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