About -f -d -s -z -x... options? [SOLVED]

[Argolance]

Bonjour,

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[ -f "$HOME/Startup/network_tray" ] && echo File exists

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[ -d "$HOME/Startup" ] && echo Directory exists

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VAR=""
[ -z "$VAR" ] && echo Variable is empty???

What is the -x option used for?
Maybe to know if the file is executable or not

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 [ -x "$HOME/.xinitrc"  ] && echo File is executable???

Is there other options of this type it would be interesting to know? Where to find a complete list?

Cordialement.

[step]

-x is for executable bit set
man test

[Argolance]

... Exactly what I was looking for: but how would I have guessed it was this 'test' command that is behind, while it is not specified inside the code line? Very useful indeed..
Thanks a lot!

[some1]

Advanced Bash-Scripting Guide:
7.2. File test operators
http://tldp.org/LDP/abs/html/fto.html

Don maintains an updated pet of the guide.

[step]

... Exactly what I was looking for: but how would I have guessed it was this 'test' command that is behind, while it is not specified inside the code line? Very useful indeed..
Thanks a lot!

In early unix systems the command '[' was a symlink to the command 'test'. Then shells evolved to include test as a built-in, and reinforced the [ ] and [[ ]] syntax. I believe [ ] works in all shells, while [[ ]] is specific to bash and maybe some other advanced shells.
You can still find older scripts that use 'test':
if test a = b; then
same as
if [ a = b ]; then
Mind that there are spaces around [ and ]

[Argolance]

All is just and perfect!