command: not found (declare: not found)

If you have any of these shebangs

Code:

#!/bin/sh
#!/bin/dash
#!/bin/bash
#!/bin/tcsh
#!/bin/zsh
#!/bin/awesome_shell

but you still call your code with

Code:

sh my_script.sh

the program effectively used will be "sh", and the shebang will be ignored.

You need to use the appropriate shell

Code:

sh   my_script.sh     # If the shebang is #!/bin/sh
dash my_script.sh     # If the shebang is #!/bin/dash
bash my_script.sh     # If the shebang is #!/bin/bash
tcsh my_script.sh     # If the shebang is #!/bin/tcsh
zsh  my_script.sh     # If the shebang is #!/bin/zsh

or better yet, just give the full or relative path of the script

Code:

./my_script.sh

then the shell used, is the same as the shebang.