Угу.

$ if [ 1 = 1 ]; then echo "1"; fi;
1
$ if [1 = 1 ]; then echo "1"; fi;
[1: command not found
$ if [ 1 = 1]; then echo "1"; fi;
bash: [: missing `]'
$if [ 1 =1 ]; then echo "1"; fi;
bash: [: 1: unary operator expected
$ if [ 1=2 ]; then echo "1"; fi;
1