105.2 Customize Or Write Simple Scripts

Question 1

Produces a sequence of numbers for a loop.

Answer 1

seq
e.g.
for i in $(seq 5000) ; do echo $i ; done

Question 2

Run script.sh with debugging.

Answer 2

bash -x script.sh

Question 3

Reassigns the output of a command as an argument to another command.

Answer 3

command substitution

Question 4

Run script.sh, which is not executable, by spawning a new shell to run the script in.

Answer 4

sh script.sh

Question 5

Path to the system’s default shell.

Answer 5

/bin/sh which is often a symbolic link to /bin/bash

Question 6

Line that identifies the script’s interpreter.

Answer 6

The shebang #! line, which is always the first line in a script.
e.g.
#! /bin/sh
If left out, the script runs in the system’s default shell.

Question 7

Get a script’s return value.

Answer 7

$?