Commands run in terminal but not inside a bash script

Question

I'm new to Linux but i'm doing a tutorial for Antlr4. Recently, I've come into a problem. When I try to set up my Antlr4 project, I run the following commands in a terminal:

antlr4 MyGram.g4
javac *.java
grun MyGram prog test.in
dot -Tpdf test.dot > test.pdf

Everything runs fine and it creates a pdf file showing the parse tree. However, when I put these commands into a bash script called build.sh:

#!/bin/bash

antlr4 MyGram.g4
javac *.java
grun MyGram prog test.in
dot -Tpdf test.dot > test.pdf

and then run the command: ./build.sh and I get the following errors and no pdf file is created:

./build.sh: line 3: antlr4: command not found
javac: file not found: *.java
Usage: javac <options> <source files>
use -help for a list of possible options
./build.sh: line 5: grun: command not found
Error: dot: can't open test.dot

Can anyone please explain the reason why I'm getting these errors ? I'm running Ubuntu 18.04 on VMware Workstation 14 Player.

It is always better to give full path of command in bash scripts if you don't want to fiddle with environment variables and profiles. — Tejas Sarade
– Tejas Sarade, Commented Jul 1, 2018 at 9:59
Also see How to use Shellcheck, How to debug a bash script? (U&L.SE), How to debug a bash script? (SO), How to debug bash script? (AskU), Debugging Bash scripts, etc. — jww
– jww, Commented Jul 1, 2018 at 10:12

ctrl-d · Accepted Answer · 2018-07-01 09:46:55Z

1

For some reason, antlr4 and grun are not in your $PATH.

type antlr4

will show you where it it. Add that to your PATH in your .bashrc or .profile

answered Jul 1, 2018 at 9:46

ctrl-d

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Comments

YaFred · Accepted Answer · 2018-07-01 10:03:23Z

1

antlr4 and grun are aliases that you have defined in your command window.

When you run your script, you are in a different environment.

So you should either:

define your aliases at the beginning of your script
not use aliases in your script

I agree with @Tejas comment: you should use full paths in your script (far easier to maintain)

answered Jul 1, 2018 at 10:03

YaFred

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