47 lines
1.6 KiB
Markdown
47 lines
1.6 KiB
Markdown
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---
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title: Quoting
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TARGET DECK: Obsidian::STEM
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FILE TAGS: bash
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tags:
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- bash
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---
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%%ANKI
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Basic
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How do you escape a `'` within a single-quote string?
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Back: This is impossible.
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Reference: Robbins, Arnold D. “GAWK: Effective AWK Programming,” October 2023. [https://www.gnu.org/software/gawk/manual/gawk.pdf](https://www.gnu.org/software/gawk/manual/gawk.pdf)
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<!--ID: 1706816752230-->
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END%%
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%%ANKI
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Basic
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What does the null string refer to?
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Back: The empty string, i.e. `""`.
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Reference: Robbins, Arnold D. “GAWK: Effective AWK Programming,” October 2023. [https://www.gnu.org/software/gawk/manual/gawk.pdf](https://www.gnu.org/software/gawk/manual/gawk.pdf)
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<!--ID: 1706816752237-->
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END%%
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%%ANKI
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Basic
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When does Bash remove null strings from a command?
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Back: When they occur as part of a non-null command-line argument.
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Reference: Robbins, Arnold D. “GAWK: Effective AWK Programming,” October 2023. [https://www.gnu.org/software/gawk/manual/gawk.pdf](https://www.gnu.org/software/gawk/manual/gawk.pdf)
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<!--ID: 1706816752241-->
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END%%
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%%ANKI
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Basic
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Why does the following not work correctly?
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```bash
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$ # -F specifies the field separator
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$ awk -F"" 'program' files
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```
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Back: Bash removes the null string before executing the command.
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Reference: Robbins, Arnold D. “GAWK: Effective AWK Programming,” October 2023. [https://www.gnu.org/software/gawk/manual/gawk.pdf](https://www.gnu.org/software/gawk/manual/gawk.pdf)
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<!--ID: 1706816764555-->
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END%%
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## References
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* Robbins, Arnold D. “GAWK: Effective AWK Programming,” October 2023. [https://www.gnu.org/software/gawk/manual/gawk.pdf](https://www.gnu.org/software/gawk/manual/gawk.pdf)
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