2.1 KiB
| title | TARGET DECK | FILE TAGS | tags | |
|---|---|---|---|---|
| Prompts | Obsidian::STEM | bash |
|
Overview
According to Robbins a POSIX-compliant shell (like Bash) generally has the primary and secondary prompts denoted with $ and > respectively. Adjust these values using environment variables $PS1 and PS2 respectively.
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Basic
What symbol is usually used to denote the primary prompt?
Back: $$
Reference: Robbins, Arnold D. “GAWK: Effective AWK Programming,” October 2023. https://www.gnu.org/software/gawk/manual/gawk.pdf
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%%ANKI
Basic
What environment variable controls Bash's primary prompt?
Back: $$PS1
Reference: Cooper, Mendel. “Advanced Bash-Scripting Guide,” n.d., 916.
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%%ANKI
Basic
What symbol is usually used to denote the secondary prompt?
Back: >
Reference: Robbins, Arnold D. “GAWK: Effective AWK Programming,” October 2023. https://www.gnu.org/software/gawk/manual/gawk.pdf
END%%
%%ANKI
Basic
What environment variable controls Bash's secondary prompt?
Back: $$PS2
Reference: Cooper, Mendel. “Advanced Bash-Scripting Guide,” n.d., 916.
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Paths supplied to commands are typically "sanitized" by prefixing the path name with ./. This is mentioned in a few different places:
find -execdirperforms this prefixing automatically on all found files.awkambiguously interprets a file named e.g.count=1as variable assignment. Should write$ awk -f program.awk ./count=1.
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Basic
What methodology is commonly used to "sanitize" paths supplied as command-line arguments?
Back: Prefixing the paths with ./.
Reference: Cooper, Mendel. “Advanced Bash-Scripting Guide,” n.d., 916.
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Bibliography
- Cooper, Mendel. “Advanced Bash-Scripting Guide,” n.d., 916.
- Robbins, Arnold D. “GAWK: Effective AWK Programming,” October 2023. https://www.gnu.org/software/gawk/manual/gawk.pdf