runcmd
Note: This is taken from the Chicken Wiki, where a more recent version could be available.
Convenience macros for running shell commands.
[syntax] (run COMMAND) [syntax] (run < COMMAND) [syntax] (run > THUNK COMMAND)
Runs COMMAND as a shell command using the system(3) library function. COMMAND should be a list where each list-element will be converted to a string and the resulting strings concatenated, separated by a single space character. COMMAND is implicitly quasi-quoted - subexpressions preceded by , or ,@ are evaluated. Sub-lists in the command are flattened and spliced into the result sequence. Quoted sub-expressions are enclosed in single quotes ('...'). Note that the characters ' ( ) { } [ ] , ; ` " | are treated specially by the Scheme reader and thus should be enclosed in double quotes (see the examples section).
If the command exists with a non-zero status code, an exception of the kinds (exn runcmd) is signalled.
If the command is preceded by <, then run returns a string containing the output of the command, with any trailing newline character removed. If the command is preceded by >, then the first argument is evaluated and COMMAND is executed with its standard input replaced by any output written to the value returned by (current-output-port) during execution of the zero argument procedure THUNK:
(run > (cut print "one\ntwo") (tac))
prints
two one
[syntax] (run* COMMAND)
Similar to run, but returns the status code of the shell command (without signalling an exception in case the status is nonzero).
[parameter] run-verbose
If true, then each command executed by run[*] is printed to the port returned by (current-output-port).
[parameter] dry-run
If true, then commands are not executed and treated as executing successfully.
Copyright (c) 2007, Felix L. Winkelmann All rights reserved.
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