SC1082

This is an encoding error that can't be seen in the script itself, but cat -v will show three bytes of garbage at the start of the file:

$ cat -v file
M-oM-;M-?#!/bin/bash
echo "hello world"

The code is correct when this garbage does not appear.

Some editors may save a file with a Byte Order Mark to mark the file as UTF-8. Shells do not understand this and will give errors on the first line:

$ bash myscript
myscript: line 1: #!/bin/sh: No such file or directory

$ dash myscript
myscript: 1: myscript: #!/bin/sh: not found

To fix it, remove the byte order mark. One way of doing this is LC_CTYPE=C sed '1s/^...//' < yourscript. Verify that it's not there with cat -v.

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