UNIX — универсальная среда программирования - Керниган Брайан Уилсон
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Интервал:
Закладка:
if (isascii(c) &&
(isprint(c) || c=='n' || c=='t' || c==' '))
putchar(c);
else if (!strip)
printf("\%03o", с);
}
3.8.61 waitfile.c
/* waitfile: wait until file stops changing */
#include <stdio.h>
#include <sys/types.h>
#include <sys/stat.h>
char *progname;
main(argc, argv)
int argc;
char *argv[];
{
int fd;
struct stat stbuf;
time_t old_time = 0;
progname = argv[0];
if (argc < 2)
error("Usage: %s filename [cmd]", progname);
if ((fd = open(argv[1], 0)) == -1)
error("can't open %s", argv[1]);
fstat(fd, &stbuf);
while (stbuf.st_mtime != old_time) {
old_time = stbuf.st_mtime;
sleep(60);
fstat(fd, &stbuf);
}
if (argc == 2) { /* copy file */
execlp("cat", "cat", argv[1], (char*)0);
error("can't execute cat %s", argv[1]);
} else { /* run process */
execvp(argv[2], &argv[2]);
error("can't execute %s", argv[2]);
}
exit(0);
}
#include "error.c"
3.8.62 watchfor
# watchfor: watch for someone to log in
PATH=/bin:/usr/bin
case $# in
0) echo 'Usage: watchfor person' 1>&2; exit 1
esac
until who | egrep "$1"
do
sleep 60
done
3.8.63 watchwho
# watchwho: watch who logs in and out
PATH=/bin:/usr/bin
new=/tmp/wwho1.$$
old=/tmp/wwho2.$$
> $old # create an empty file
while : # loop forever
do
who >$new
diff $old $new
mv $new $old
sleep 60
done | awk '/>/ { $1 = "in: "; print }
/</ { $1 = "out: "; print }'
3.8.64 which1
# which cmd: which cmd in PATH is executed, version 1
case $# in
0) echo 'Usage: which command' 1>&2; exit 2
esac
for i in `echo $PATH | sed 's/^:/.:/
s/::/:.:/g
s/:$/:./
s/:/ /g'`
do
if test -f $i/$1 # use test -x if you can
then
echo $i/$1
exit 0 # found it
fi
done
exit 1 # not found
3.8.65 which1.H
# which cmd: which cmd in PATH is executed, version 1
case $# in
0) echo 'Usage: which command' 1>&2; exit 2
esac
for i in `echo $PATH | sed 's/^:/.:/
s/::/:.:/g
s/:$/:./
s/:/ /g'`
do
if test -f $i/$1 # use test -x if you can
then
echo $i/$1
exit 0 # found it
fi
done
exit 1 # not found
@@@ Fri Oct 14 14:21:11 EDT 1983 original version
3.8.66 which2
# which cmd: which cmd in PATH is executed, final version
