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55 lines
2.1 KiB
ReStructuredText
Bash to Xonsh Translation Guide
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================================
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As you have probably figured out by now, xonsh is not ``sh``-lang compliant.
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If your muscles have memorized all of the Bash prestidigitations, this page
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will help you put a finger on how to do the equivalent task in xonsh.
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.. list-table::
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:widths: 30 30 40
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:header-rows: 1
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* - Bash
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- Xonsh
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- Notes
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* - ``$NAME`` or ``${NAME}``
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- ``$NAME``
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- Look up an environment variable by name.
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* - ``echo "$HOME/hello"``
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- ``echo "$HOME/hello"``
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- Construct an argument using an environment variable.
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* - ``something/$SOME_VAR/$(some_command)``
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- ``@('something/' + $SOME_VAR + $(some_command).strip())``
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- Concatenate a variable or text with the result of running a command.
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* - ``${!VAR}``
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- ``${var or expr}``
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- Look up an environment variable via another variable name. In xonsh,
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this may be any valid expression.
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* - ``$(cmd args)`` or ```cmd args```
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- ``@$(cmd args)``
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- Command substitution (allow the output of a command to replace the
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command itself). Tokenizes and executes the output of a subprocess
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command as another subprocess.
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* - ``set -e``
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- ``$RAISE_SUBPROC_ERROR = True``
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- Cause a failure after a non-zero return code. Xonsh will raise a
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``supbrocess.CalledProcessError``.
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* - ``set -x``
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- ``trace on``
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- Turns on tracing of source code lines during execution.
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* - ``&&``
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- ``and`` or ``&&``
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- Logical-and operator for subprocesses.
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* - ``||``
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- ``or`` as well as ``||``
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- Logical-or operator for subprocesses.
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* - ``$?``
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- ``_.rtn``
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- Returns the exit code, or status, of the previous command.
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* - ``N=V command``
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- ``with ${...}.swap(N=V): command``
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- Set temporary environment variable(s) and execute for command.
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Use an indented block to execute many commands in the same context.
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* - ``!$``
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- ``__xonsh_history__[-1, -1]``
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- Get the last argument of the last command
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