Control Structures, con't

• for/in/do/done

  • for i in foo*
  • do
    • mv $i ${i}.bak
  • done

• For loop list whitespace separated (foreach in perl)

• A C-like "for" is available but rarely used

• Conditional control operators || and &&

  • touch /etc/motd || echo "Error" >&2
  • touch /etc/motd && echo "wrote to motd" >&2

• Loops and branches can be nested as expected. Use whitespace and CRs to make your scripts look sane

• More complex arithmetic and conditionals are allowed, but less used; see man bash, "let" command, "test" command help, etc.

Notes: