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Oils Reference — Chapter Special Variables
This chapter describes special variables for OSH and YSH.
(in progress)
Replacement for "$@"
A Dict that's populated with environment variables. Example usage:
var x = ENV.PYTHONPATH
echo $[ENV.SSH_AUTH_SOCK]
It's initialized exactly once per process, in any of these situations:
shopt --set env_obj is on. This is true when invoking
bin/ysh.bin/osh -o ysh:upgrade or ysh:all.shopt --set ysh:upgrade or ysh:all.The directory the current script resides in. This knows about 3 situations:
oshrc in an interactive shellosh myscript.shsource builtinIt's useful for "relative imports".
_statusDEPRECATED: Use _error.code instead.
_errorA Dict that's set by the try builtin.
The integer _error.code is always present:
try {
ls /tmp
}
echo "status is $[_error.code]"
Some errors also have a message field, like JSON/J8 encoding/decoding errors,
and user errors from the error builtin.
try {
echo $[toJson( /d+/ )] # invalid Eggex type
}
echo "failed: $[_error.message]" # => failed: Can't serialize ...
_pipeline_statusAfter a pipeline of processes is executed, this array contains the exit code of each process.
Each exit code is an Int. Compare with
PIPESTATUS.
_process_sub_statusThe exit status of all the process subs in the last command.
YSH read sets this variable:
read --all < myfile
echo $_reply
OILS_VERSIONThe version of Oils that's being run, e.g. 0.23.0.
LIB_OSHThe string ///osh, which you can use with the source builtin.
source $LIB_OSH/two.sh
LIB_YSHThe string ///ysh, which you can use with the source builtin.
source $LIB_YSH/yblocks.ysh
OILS_GC_THRESHOLDAt a GC point, if there are more than this number of live objects, collect garbage.
OILS_GC_ON_EXITSet OILS_GC_ON_EXIT=1 to explicitly collect and free() before the process
exits. By default, we let the OS clean up.
Useful for ASAN testing.
OILS_GC_STATSWhen the shell process exists, print GC stats to stderr.
OILS_GC_STATS_FDWhen the shell process exists, print GC stats to this file descriptor.
The float value for "not a number".
(The name is consistent with the C language.)
The float value for "infinity". You can negate it to get "negative infinity".
(The name is consistent with the C language.)
__provide__A module is evaluated upon use. After evaluation, the names in the
__provide__ List are put in the resulting module Obj instance.
Used for word splitting. And the builtin shSplit() function.
TODO: bash compat
TODO: bash compat
bash compat: serialized options for the set builtin.
bash compat: serialized options for the shopt builtin.
$HOME is used for:
Note: The shell doesn't set $HOME. According to POSIX, the program that invokes the login shell sets it based on /etc/passwd.
A colon-separated string that's used to find executables to run.
Result of regex evaluation [[ $x =~ $pat ]].
After a pipeline of processes is executed, this array contains the exit code of each process.
Each exit code is a Str. Compare with
_pipeline_status.
The name of the "host" or machine that Oils is running on, determined by
gethostname().
The operating system that Oils is running on, determined by uname().
Examples: linux darwin ...
TODO
TODO
An array of words, split by : and = for compatibility with bash. New completion scripts should use COMP_ARGV instead.
Discouraged; for compatibility with bash.
Discouraged; for compatibility with bash.
Discouraged; for compatibility with bash.
Discouraged; for compatibility with bash.
User-defined completion functions should Fill this array with candidates. It is cleared on every completion request.
An array of partial command arguments to complete. Preferred over COMP_WORDS. The compadjust builtin uses this variable.
(An OSH extension to bash.)
Override the default OSH history location.
Override the default YSH history location.
OSH read sets this:
read < myfile
bash compat
bash compat