UNIX — универсальная среда программирования - Керниган Брайан Уилсон
3.8.4 backwards
# backwards: print input in backward line order
awk ' { line[NR] = $0 }
END { for (i = NR; i > 0; i--) print line[i] } ' $*
3.8.5 badpick.c
pick(s) /* offer choice of s */
char *s;
{
fprintf("%s? ", s);
if (ttyin() == 'y')
printf("%sn", s);
}
3.8.6 bundle
# bundle: group files into distribution package
echo '# To unbundle, sh this file'
for i
do
echo "echo $i 1>&2"
echo "cat >$i <<'End of $i'"
cat $i
echo "End of $i"
done
3.8.7 cal
# cal: nicer interface to /usr/bin/cal
case $# in
0) set `date`; m=$2; y=$6 ;; # no args: use today
1) m=$1; set `date`; y=$6 ;; #1 arg: use this year
*) m=$1; y=$2 ;; #2 args: month and year
esac
case $m in
jan*|Jan*) m=1 ;;
feb*|Feb*) m=2 ;;
mar*|Mar*) m=3 ;;
apr*|Apr*) m=4 ;;
may*|May*) m=5 ;;
jun*|Jun*) m=6 ;;
jul*|Jul*) m=7 ;;
aug*|Aug*) m=8 ;;
sep*|Sep*) m=9 ;;
oct*|Oct*) m=10 ;;
nov*|Nov*) m=11 ;;
dec*|Dec*) m=12 ;;
[1-9]|10|11|12) ;; # numeric month
*) y=$m; m="" ;; # plain year
esac
/usr/bin/cal $m $y # run the real one
3.8.8 calendar1
# calendar: version 1 -- today only
awk <$HOME/calendar '
BEGIN { split("'"`date`"'", date) }
$1 == date[2] && $2 == date[3]
' | mail $NAME
3.8.9 calendar2
# calendar: version 2 -- today only, no quotes
(date; cat $HOME/calendar) |
awk '
NR == 1 { mon = $2; day = $3 } # set the date
NR > 1 && $1 == mon && $2 == day # print calendar lines
' | mail $NAME
3.8.10 calendar3
# calendar: version 3 -- today and tomorrow
awk <$HOME/calendar '
BEGIN {
x = "Jan 31 Feb 28 Mar 31 Apr 30 May 31 Jun 30 "
"Jul 31 Aug 31 Sep 30 Oct 31 Nov 30 Dec 31 Jan 31"
split(x, data)
for (i = 1; i < 24; i += 2) {
days[data[i]] = data[i+1]
nextmon[data[i]] = data[i+2]
}
split("'"`date`"'", date)
mon1 = date[2]; day1 = date[3]
mon2 = mon1; day2 = day1 + 1
if (day1 >= days[mon1]) {
day2 = 1
mon2 = nextmon[mon1]
}
}
$1 == mon1 && $2 == day1 || $1 == mon2 && $2 == day2
' | mail $NAME
3.8.11 cat0.c
/* cat: minimal version */
#define SIZE 512 /* arbitrary */
main() {
char buf[SIZE];
int n;
while ((n = read(0, buf, sizeof buf)) > 0)
write(1, buf, n);
exit(0);
}
3.8.12 checkmail.c
/* checkmail: watch user's mailbox */
#include <stdio.h>
#include <sys/types.h>
#include <sys/stat.h>
char *progname;
char *maildir = "/usr/spool/mail"; /* system dependent */
main(argc, argv)
