RE: ash does not understand '~'

[Jörg Schaible <Joerg dot Schaible at Elsag-Solutions dot com>]

Hi Ralf,

Ralf Habacker wrote on Friday, October 17, 2003 12:20 PM:
> the following shell script does not work at least with
> ash-20031007-1 although I don't see any reason why this
> should not be a valid syntax. If you use
> 
> 	export PATH=${HOME}:/usr/bin
> 
> then the scripts runs. bash has no problems with this.
> 
> 
> --- ~/test -------
> #!/bin/sh
> export PATH=~:/usr/bin
> test2
> 
> --- ~/test2 -------
> #!/bin/sh
> echo "test2"


ash does not know "~", see:

$ sh 
\[\033]0;\w\007
\033[1m\]\[\033[34m\][$SHLVL] \[\033[32m\]\u@\h \[\033[33m\w\033[0m\]
$ cd /
\[\033]0;\w\007
\033[1m\]\[\033[34m\][$SHLVL] \[\033[32m\]\u@\h \[\033[33m\w\033[0m\]
$ cd ~
cd: can't cd to ~
\[\033]0;\w\007
\033[1m\]\[\033[34m\][$SHLVL] \[\033[32m\]\u@\h \[\033[33m\w\033[0m\]
$ exit


BTW: It does also not know the "[ ]" syntax for a built-in test, you always have to use "test":

if test -f /etc/hosts; then
	echo "/etc/hosts exist!"
fi

and you cannot combine export with an assignment, you have to write separate statements:

VARIABLE=test
export VARIABLE

Just a short overview over the most common pitfalls :)

Regards,
Jörg

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