September 04, 2006

Quotes in Unix Shell and JSTL

Double quote and single quote is different.

Double quote: Everything between quotes is take literally, except for the following characters that keep there special meaning:
  • $ variable substitution will occure
  • ` command subtitution will occure
  • \ escape next character
  • ! history character
  • newline
Single quote: everything between quotes is take literally, except for the
  • ! history
  • newline.

For my scripts, it is much safer to use double quote.

One of my script is like this:

/usr/bin/egrep '$2' $1         
if [ $? -eq 0 ] ; then

the single quote surounding $2 caused confusion.

Not so sure about their difference in JSTL. In the “Core JSTL” book, single quote is used.


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