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| 2 | Builtin Commands <a class="group-link" href="chap-builtin-cmd">builtin-cmd</a>
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| 3 |
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| 4 |
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| 5 | [Memory] cmd/append Add elements to end of array
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| 6 | pp asdl cell X gc-stats line proc
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| 7 | [Handle Errors] try Run with errexit, set _status _error
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| 8 | boolstatus Enforce 0 or 1 exit status
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| 9 | error error 'failed' (status=2)
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| 10 | [Shell State] ysh-cd ysh-shopt compatible, and takes a block
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| 11 | shvar Temporary modify global settings
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| 12 | ctx Share and update a temporary "context"
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| 13 | push-registers Save registers like $?, PIPESTATUS
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| 14 | [Modules] runproc Run a proc; use as main entry point
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| 15 | module guard against duplicate 'source'
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| 16 | is-main false when sourcing a file
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| 17 | use change first word lookup
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| 18 | [I/O] ysh-read flags --all, -0
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| 19 | ysh-echo no -e -n with simple_echo
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| 20 | write Like echo, with --, --sep, --end
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| 21 | fork forkwait Replace & and (), and takes a block
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| 22 | fopen Open multiple streams, takes a block
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| 23 | X dbg Only thing that can be used in funcs
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| 24 | X log X die Common functions (polyfill)
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| 25 | [Hay Config] hay haynode For DSLs and config files
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| 26 | [Completion] compadjust compexport
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| 27 | [Data Formats] json read write
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| 28 | json8 read write
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| 29 | X [TSV8] rows pick rows; dplyr filter()
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| 30 | cols pick columns ('select' already taken)
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| 31 | group-by add a column with a group ID [ext]
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| 32 | sort-by sort by columns; dplyr arrange() [ext]
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| 33 | summary count, sum, histogram, etc. [ext]
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| 34 | [Args Parser] parser Parse command line arguments
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| 35 | flag
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| 36 | arg
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| 37 | rest
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| 38 | parseArgs()
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| 39 | X [Testing] describe Test harness
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| 40 | assert takes an expression
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