UNIX for Dummies Questions & Answers

[mute@geek ~]$ cat subshell
#!/bin/busybox sh

i=0
printf '%s\n' foo bar baz | while read var; do
        let i++
        echo "subshell i = $i"
done

echo "main shell i = $i"
[mute@geek ~]$ ./subshell
subshell i = 1
subshell i = 2
subshell i = 3
main shell i = 0

[mute@geek ~]$ cat subshell
#!/bin/busybox sh

i=0
printf '%s\n' foo bar baz | while read var; do
        exit # from subshell ...
        echo "subshell is alive"
done

echo "main shell is alive"
[mute@geek ~]$ ./subshell
main shell is alive

check() {
    local file=$1

    # do something with file
}

for file in *.tar; do
    [ -e "$file" ] || continue # if no *.tar file, $file will be '*.tar' so check if file is really existing
    check "$file"
done