string,shell,loops,split,sh , How to split and iterate substrings by delimiter in BOURNE SHELL?


How to split and iterate substrings by delimiter in BOURNE SHELL?

Question:

Tag: string,shell,loops,split,sh

Recently I've been trying to customize my shell profile located at ~/.profile in Ubuntu. One thing I want to do is:

# PATH-like variable containing paths separated by ':'
MY_ROOTS=/f/o/o:/b/a/r:/e/t/c
for some magic iterating my_root in $MY_ROOTS do;
    my_bin="$my_root/bin"
    # add it to PATH!
    [ -d "$my_bin" ] && {
        expr ":$PATH:" : ".*:$my_bin:.*" >/dev/null || PATH="${PATH:+"$PATH:"}$my_bin"
    }
done

Since it's in .profile, I need the iterating part to be Bourne Shell compatible. Many people had asked some questions like this, but I believed that most those solutions looked like Bashism. After I spent a lot of time googling, I still hadn't found a suitable answer. May I have your advice please?


Answer:

Try:

OIFS="$IFS"
IFS=:
MY_ROOTS=/f/o/o:/b/a/r:/e/t/c
for my_root in $MY_ROOTS; do
    # your code here with $my_root
done
IFS="$OIFS"

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