error trap

gistfile1.txt

danp@lisa:~$ cat test.sh 
#!/bin/bash

set -e

grep 'foo' /file/which/doesnt/exist || echo 'grep failed'

if some-non-existant-command
then
    echo 'Its a bug'
else
    echo 'report error'
fi

echo 'We get here'
grep 'foo' /file/which/doesnt/exist
echo 'but not here'
danp@lisa:~$ ./test.sh 
grep: /file/which/doesnt/exist: No such file or directory
grep failed
./test.sh: line 7: some-non-existant-command: command not found
report error
We get here
grep: /file/which/doesnt/exist: No such file or directory