Why can't I change directories using cd in a script?
Shell scripts are run inside a subshell, and each subshell has its own concept of what the current directory is. The cd succeeds, but as soon as the subshell exits, you're back in the interactive shell and nothing ever changed there.
One way to get around this is to use an alias instead:
alias proj="cd /home/tree/projects/java"
LINUX CD command does not work in shell script
Use an absolute path or, even better, an environment variable.
cd ~/Desktop
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