Implementing built-ins (POSIX portability)

[magicant]

This issue tracks minimum POSIX-compliant implementation of built-in utilities. Non-portable features are tracked in #265.

In the list below, built-ins are grouped by their dependent environments. However, most built-ins additionally depend on the standard output and error file descriptors and variables.

Nop

• :
  • [x] #322
• true
  • [x] 3d3fe8ee4efbb032a40b8e876fc7d23f72d69c51
• false
  • [x] 854b7ff3295c663d0bbecd40bd393f29a72256ab

Execution control

• .
  • [x] #324
• break
  • [x] #188
• continue
  • [x] #189
• eval
  • [x] #323
• exec
  • [x] #231
• exit
  • [x] #266
  • [x] #268
• ~~newgrp~~
• return
  • [x] #271

Working directory

• cd
  • [x] #284
• pwd
  • [x] #278

File creation mask

• umask
  • [x] #354

Limits

• ulimit
  • [x] #355

Spent times

• times
  • [x] #351

Signals

• kill
  • [x] #346
• trap
  • [x] #337

Jobs

• bg
  • [x] #339
• fg
  • [x] #339
• jobs
  • [x] #155
• wait
  • [x] #152

Variables and functions

• export
  • [x] #319
• getopts
  • [x] #326
• read
  • [x] #327
• readonly
  • [x] #320
• shift
  • [x] #305
• unset
  • [x] #301

Aliases

• alias
  • [x] #328
• unalias
  • [x] #329

Command path cache

• hash
  • [ ] Hash built-in
    • Show cached utilities
    • Update utility path cache
    • Clear utility path cache

Command history

• fc
  • [ ] Fc built-in
    • Semantics
      • Show command history
      • Edit and execute a command from history
    • Portable options
      • -e ...
      • -l
      • -n
      • -r
      • -s

Miscellaneous

• command, type (Mostly related with execution control, but also dependent on file system, aliases, functions, and command path cache)
  • [x] #347
    • [ ] Extend support for confstr on more systems
  • [x] #350
• set (Related with shell options and variables)
  • [x] #149