13.3 Awk
References for Awk:
-
Effective awk Programming, 3rd edition (O'Reilly)
-
Sed & awk, 2nd edition (O'Reilly)
-
mawk(1) and gawk(1)
-
info gawk
Short program example (creates newusers command entry):
#!/usr/bin/awk -f
# Script to create a file suitable for use in the 'newusers' command,
# from a file consisting of user IDs and passwords in the form:
# first_name last_name password
# Copyright (c) KMSelf Sat Aug 25 20:47:38 PDT 2001
# Distributed under GNU GPL v 2, or at your option, any later version.
# This program is distributed WITHOUT ANY WARRANTY.
BEGIN {
# Assign starting UID, GID
if ( ARGC > 2 ) {
startuid = ARGV[1]
delete ARGV[1]
}
else {
printf( "Usage: newusers startUID file\n" \
" where:\n" \
" startUID is the starting userid to add, and\n" \
" file is an input file in form:\n" \
" first_name last_name password\n" \
)
exit
}
infile = ARGV[1]
printf( "Starting UID: %s\n\n", startuid )
}
/^#/ { next }
{
++record
first = $1
last = $2
passwd = $3
user= substr( tolower( first ), 1, 1 ) tolower( last )
uid = startuid + record - 1
gid = uid
printf( "%s:%s:%d:%d:%s %s,,/home/%s:/bin/bash\n", \
user, passwd, uid, gid, first, last, user \
)
}
Two packages provide POSIX awk in Debian:
