To make a if-clause in Sh

Question

I have the following in a file which is sourced both by .bashrc and .zshrc. The syntax is from the site.

if $SHELL=/bin/zsh                                                               
         then
     # to not java .class when running java 
             myclasslist () { reply=(${$(ls *.class)%.class}) }
             compctl -K myclasslist java
fi

Both Zsh and Bash go upset of it.

How can you make a if -clause in sh?

Answer 1

You need to wrap your condition in the test operator (as well as quotes to get in the habit):

In shell:

#!/bin/sh
if [ "$SHELL" = "/bin/zsh" ]; then
       # do your thing
fi

In bash:

#!/bin/bash
if [ "$SHELL" == "/bin/zsh" ]; then
    # just do it!
fi

Answer 2

You need the test alias [ command:

if [ "$SHELL" = "/bin/zsh" ]
then
    myclasslist () { reply=(${$(ls *.class)%.class}) }
    compctl -K myclasslist java
fi

Answer 3

On the web site you mention, they do not use the test operator ([]) because they say:

For example, cat returns 0 if it runs successfully, and 1 if it encounters an error

The if must be followed by a "boolean statement" and if this statement returns 0, the "then" is actually executed...

In your case, Seth's answer is what you're looking for.