basename.1

<B>Digital的Unix操作系统VAX 4.2源码</B>

.\" SCCSID: @(#)basename.1	8.2	12/5/90
.TH basename 1
.SH Name
basename \- strip directory names from pathname
.SH Syntax
.B basename
.I string
[
.I suffix
]
.SH Description
.NX R "basename command"
.NX R "file name" "stripping affixes"
The
.PN basename
command
deletes from 
.I string
any prefix up to and including the last slash
.BR ( / )
and the suffix (if specified), and prints the result on the standard
output.  The
.PN basename
command handles limited regular expressions in the same manner as
.MS ed 1 ;
metacharacters must be escaped if they are intended to be interpreted
literally.  For example:
.EX
% \f(CBbasename /vmunix .x\f(CW
vmun
% \f(CBbasename /vmunix '\e.x'\f(CW
vmunix
.EE
In the first example,
.PN basename
returns
.PN vmun
because it interprets the
.PN \&.x
as a regular expression consisting of any character followed by the
letter
.PN x .
In the second example, the dot is escaped; there is no match on a dot
followed by
.PN x ,
and
.PN basename
returns
.PN vmunix .
.PP
The
.PN basename
command is often used inside substitution marks
.BR ( \`\ \` )
within shell procedures.
.SH Examples
The following example shell script compiles the file
.PN /usr/src/bin/cat.c
and moves the output to
.PN cat
in the current directory:
.EX
cc /usr/src/bin/cat.c
mv a.out \`basename $1 .c\`
.EE
The following example echoes only the base name of the file
.PN /etc/syslog.conf
by removing the prefix and any possible sequence of characters
following the period in the file's name:
.EX
% \f(CBbasename /etc/syslog.conf '\e..*'\f(CW
syslog
.EE
.SH See Also
dirname(1), ex(1), sh(1)