BashPitfalls – Greg’s Wiki

 

Bash Pitfalls

This page shows common errors that Bash programmers make. The following examples are all flawed in some way:

 

Contents

1. for i in `ls *.mp3`
2. cp $file $target
3. Filenames with leading dashes
4. [ $foo = “bar” ]
5. cd `dirname “$f”`
6. [ “$foo” = bar && “$bar” = foo ]
7. [[ $foo > 7 ]]
8. grep foo bar | while read line; do ((count++)); done
9. if [grep foo myfile]
10. if [bar=”$foo”]
11. if [ [ a = b ] && [ c = d ] ]
12. cat file | sed s/foo/bar/ > file
13. echo $foo
14. $foo=bar
15. foo = bar
16. echo <<EOF
17. su -c ‘some command’
18. cd /foo; bar
19. [ bar == “$foo” ]
20. for i in {1..10}; do ./something &; done
21. cmd1 && cmd2 || cmd3
22. On UTF-8 and Byte-Order Marks (BOM)
23. echo “Hello World!”
24. for arg in $*
25. function foo()
26. echo “~”
27. local varname=$(command)
28. foo=”hello”; sed -e ‘s/$foo/good bye/’
29. tr [A-Z] [a-z]

 

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