Linux › Section K · Shell scripts › Topic K.7
Subshells, including files, and reading input
Three features decide where a script's commands run and where its data comes from: subshells give a throwaway copy of the environment, sourcing pulls another file into the current shell, and read takes input from the user. Shell functions, which package commands under a name, complete the toolkit.
In this topic
- Subshells: a disposable environment
- One-off environment changes
- Subshells you did not ask for
- Worked example: copying a tree through a pipe
- Including other files with . and source
- Reading input with read
- Worked example: an "Are you sure?" prompt
- Shell functions
- Worked example: a validating function
- Common mistakes to avoid
- Key takeaways
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