RE: Command Prompt is not working after entering "man ls" command

user:/home/simulations/public_sim_ws/src/all/ros_basics_examples/linux_demo$ ./demo.sh
./demo.sh: line 4: 1501ARG1: command not found
./demo.sh: line 5: [: ==: unary operator expected
./demo.sh: line 15: [: ==: unary operator expected
./demo.sh: line 25: [: ==: unary operator expected

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