.TH CTAGS UCB 2/24/79 UCB
.SH NAME
ctags \- compute a tags file for a C program
.SH SYNOPSIS
.B ctags
name ...
.SH DESCRIPTION
.I Ctags
makes a tags file for
.IR ex (UCB)
from the specified C programs.
A tags file gives the locations of specified objects (in this case
functions) in a group of files.
Each line of the tags file contains the function name,
the file in which it is defined, and a scanning pattern used to find
the function definition.  These are given in separate fields on the line,
separated by blanks or tabs.
.SH FILES
.DT
tags	output tags file
.SH SEE ALSO
astags(UCB), ex(UCB), vi(UCB)
.SH BUGS
This tags program is a primitive shell script, and requires functions
to be recognizable by their starting in the first column of
input lines on lines ending with a `)'.
.PP
No way to use it to incrementally update a tags file.
In a 
.I makefile,
we could move the
.I tags
file away and then use
.I sort
and
.I uniq
to get around this.
.PP
For tags to be more useful, a good
.I ctags
program is needed which references external and macro definitions in
header files as well as being less sensitive to formatting.