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Full Discussion: Bash to sh conversion
Top Forums Shell Programming and Scripting Bash to sh conversion Post 302891208 by SkySmart on Tuesday 4th of March 2014 11:29:56 AM
Old 03-04-2014
Bash to sh conversion
Code:
declare -i DEFINT=1
declare -i DEFDELAY=1
declare -i timeout=DEFTOUT
declare -i interval=DEFINT
declare -i delay=DEFDELAY

if (($# == 0 || interval <= 0)); then
    printUsage
    exit 1
fi

(
    ((t = timeout))

    while ((t > 0)); do
        sleep $interval
        kill -0 $$ || exit 0
        ((t -= interval))
    done

    kill -s SIGTERM $$ && kill -0 $$ || exit 0
    sleep $delay
    kill -s SIGKILL $$
) 2> /dev/null &

this works quite well if the first line of the script is: #!/bin/bash.

but i need this to run in a sh script, a script whose first line is: "#!/bin/sh"

how can the above be written in sh so it passes?

I tried the following and it failed miserably:

Code:
DEFINT=1
DEFDELAY=1
timeout=${DEFTOUT}
interval=${DEFINT}
delay=${DEFDELAY}

if [ $# -eq 0 ] || [ ${interval} -le 0] ; then
    echo "ERROR: WRONG USAGE!"
    exit 1
fi

t=${timeout}

    while (($t > 0)); do
        sleep $interval
        kill -0 $$ || exit 0
        (($t -= $interval))
    done

    kill -s SIGTERM $$ && kill -0 $$ || exit 0
    sleep $delay
    kill -s SIGKILL $$

 

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LEARN ABOUT XFREE86

kill

KILL(1)                                                            User Commands                                                           KILL(1)

NAME

       kill - send a signal to a process

SYNOPSIS

       kill [options] <pid> [...]

DESCRIPTION

       The  default  signal  for kill is TERM.  Use -l or -L to list available signals.  Particularly useful signals include HUP, INT, KILL, STOP,
       CONT, and 0.  Alternate signals may be specified in three ways: -9, -SIGKILL or -KILL.  Negative PID values may be  used  to  choose  whole
       process  groups;  see  the  PGID  column  in ps command output.  A PID of -1 is special; it indicates all processes except the kill process
       itself and init.

OPTIONS

       <pid> [...]
              Send signal to every <pid> listed.

       -<signal>
       -s <signal>
       --signal <signal>
              Specify the signal to be sent.  The signal can be specified by using name or number.  The behavior of signals is explained  in  sig-
              nal(7) manual page.

       -l, --list [signal]
              List signal names.  This option has optional argument, which will convert signal number to signal name, or other way round.

       -L, --table
              List signal names in a nice table.

       NOTES  Your shell (command line interpreter) may have a built-in kill command.  You may need to run the command described here as /bin/kill
              to solve the conflict.

EXAMPLES

       kill -9 -1
              Kill all processes you can kill.

       kill -l 11
              Translate number 11 into a signal name.

       kill -L
              List the available signal choices in a nice table.

       kill 123 543 2341 3453
              Send the default signal, SIGTERM, to all those processes.

SEE ALSO

       kill(2), killall(1), nice(1), pkill(1), renice(1), signal(7), skill(1)

STANDARDS

       This command meets appropriate standards. The -L flag is Linux-specific.

AUTHOR

       Albert Cahalan <albert@users.sf.net> wrote kill in 1999 to replace a bsdutils one that was not standards  compliant.   The  util-linux  one
       might also work correctly.

REPORTING BUGS

       Please send bug reports to <procps@freelists.org>

procps-ng                                                          October 2011                                                            KILL(1)
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