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A string between $' and ' may contain backslash escape sequences similar to the ones in a C string constant (except that a single-quote must be escaped and a double-quote need not be). Details are in the sh(1) man page. This construct is useful to include unprintable characters, tabs and newlines in strings; while this can be done with a command substitution containing a printf command, that needs ugly workarounds if the result is to end with a newline as command substitution removes all trailing newlines. The construct may also be useful in future to describe unprintable characters without needing to write those characters themselves in 'set -x', 'export -p' and the like. The implementation attempts to comply to the proposal for the next issue of the POSIX specification. Because this construct is not in POSIX.1-2008, using it in scripts intended to be portable is unwise. Matching the minimal locale support in the rest of sh, the \u and \U sequences are currently not useful. Exp-run done by: pav (with some other sh(1) changes) |
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| .. | ||
| build | ||
| debugscripts | ||
| diag | ||
| kerneldoc | ||
| KSE | ||
| LibraryReport | ||
| regression | ||
| sched | ||
| test | ||
| tools | ||
| install.sh | ||
| make_libdeps.sh | ||
| README | ||
$FreeBSD$ This directory tree contains tools used for the maintenance and testing of FreeBSD. There is no toplevel Makefile structure since these tools are not meant to be built as part of the standard system, though there may be individual Makefiles in some of the subdirs. Please read the README files in the subdirs for further information.