Further Reading

• man sed and info sed and online manual
• Information about various implementations of sed
  • sed FAQ, great resource, but last modified 10 March 2003
  • stackoverflow: BSD/macOS sed vs GNU sed vs the POSIX sed specification
  • unix.stackexchange: Differences between sed on Mac OSX and other standard sed
  • grymoire: sed tutorial — has details on differences between various sed versions as well
• Q&A on stackoverflow/stackexchange are good source of learning material, good for practice exercises as well
  • sed Q&A on unix stackexchange
  • sed Q&A on stackoverflow
• Learn Regular Expressions (has information on flavors other than BRE/ERE too)
  • regular-expressions — tutorials and tools
  • rexegg — tutorials, tricks and more
  • stackoverflow: What does this regex mean?
  • online regex tester and debugger — not fully suitable for CLI tools, but most of ERE syntax works
• Related tools
  • rpl — search and replace tool, has interesting options like interactive mode and recursive mode
  • sedsed — Debugger, indenter and HTMLizer for sed scripts
  • xo — composes regular expression match groups
  • sd — simple search and replace, implemented in Rust
• My ebooks on CLI text processing tools

Here are resource links for specific topics:

• ASCII reference and locale usage
  • ASCII code table
  • wiki.archlinux: locale
  • shellhacks: Define Locale and Language Settings
  • unix.stackexchange: What does LC_ALL=C do?
• unix.stackexchange: When to use grep, sed, awk, perl, etc
• unix.stackexchange: replace multiline string
• stackoverflow: deleting empty lines with optional white spaces
• unix.stackexchange: print only line above the matching line
• stackoverflow: get lines between two patterns only if there is third pattern between them
  • unix.stackexchange: similar example