Shell Programming and Scripting

if test ./load.sh ; then
    echo "0"
else
    echo "1"
fi

return 1;

$ ./tests.sh
0

#!/bin/bash

/bin/sh

 echo $SHELL

Owner@Owner-PC ~
$ chmod +x test.sh

Owner@Owner-PC ~
$ ./test.sh
./test.sh: line 2: return: can only `return' from a function or sourced script

Owner@Owner-PC ~
$ bash --version
GNU bash, version 4.4.5(1)-release (x86_64-unknown-cygwin)
Copyright (C) 2016 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>

This is free software; you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law.

#!/bin/bash

if test ./load.sh ; then
    echo "0"
else
    echo "1"
fi

#!/bin/bash

return main

int main()
{
    return 1; //1 means EXIT_FAILURE
}

$ g++ main.cpp -o main
$ ./tests.sh
0

#!/bin/bash

return main

load.sh: line 2: return: main: numeric argument required
load.sh: line 2: return: can only `return' from a function or sourced script

#!/bin/bash
main
rc=$?
if [ $rc -eq 0 ]
then	exit 0
else	exit $rc
fi

#!/bin/bash
main
rc=$?
if [ $rc -eq 0 ]
then	exit 0
fi
exit $rc

#!/bin/bash
main
rc=$?
exit $rc

#!/bin/bash
main
exit $?

#!/bin/bash
main

#!/bin/bash
main
rc=$?
exit $rc

$ ./tests.sh
0

$ ./load.sh
./load.sh: line 2: main: command not found
127
$ ls
load.sh  load.sh~  main  main.cpp  main.cpp~  tests.sh  tests.sh~

#!/bin/bash
./main
rc=$?
echo $rc
exit $rc

$ ./load.sh
1

$  ./tests.sh
0

if ./load.sh ; then
    echo "0"
else
    echo "1"
fi

string
True if the string string is not the null string; otherwise, false.