UNIX — универсальная среда программирования - Керниган Брайан Уилсон Страница 187

opath=$PATH PATH=/bin:/usr/bin

case $# in

0) echo 'Usage: which command' 1>&2; exit 2

esac

for i in `echo $opath | sed 's/^:/.:/

                             s/::/:.:/g

                             s/:$/:./

                             s/:/ /g'`

do

 if test -f $i/$1 # this is /bin/test

 then # or /usr/bin/test only

  echo $i/$1

  exit 0 # found it

 fi

done

exit 1 # not found

3.8.67 wordfreq

awk ' { for (i = 1; i <= NF; i++) num[$i]++ }

END {for (word in num) print word, num[word] }

' $*

3.8.68 zap1

# zap pattern: kill all processes matching pattern

# BUG in this version

PATH=/bin:/usr/bin

case $# in

0) echo 'Usage: zap pattern' 1>&2; exit 1

esac

kill `pick \`ps -ag | grep "$*"\` | awk '{print $1}'`

3.8.69 zap2

# zap pat: kill all processes matching pat

# final version

PATH=/bin:/usr/bin

IFS='

' # just a newline

case $1 in

"") echo 'Usage: zap [-2] pattern' 1>&2; exit 1 ;;

-*) SIG=$1; shift

esac

echo ' PID TTY TIME CMD'

kill $SIG `pick \`ps -ag | egrep "$*"|` | awk '{print $1}'`

3.8.70 zap.c

/* zap: interactive process killer */

#include <stdio.h>

#include <signal.h>

char *progname; /* program name for error message */

char *ps = "ps -ag"; /* system dependent */

main(argc, argv)

 int argc;

 char *argv[];

{

 FILE *fin, *popen();

 char buf[BUFSIZ];

 int pid;

 progname = argv[0];

 if ((fin = popen(ps, "r")) == NULL) {

  fprintf (stderr, "%s: can't run %s\n", progname, ps);

  exit(1);

 }

 fgets(buf, sizeof buf, fin); /* get header line */

 fprintf (stderr, "%s", buf);

 while (fgets(buf, sizeof buf, fin) != NULL)

  if (argc == 1 || strindex(buf, argv[1]) >= 0) {

   buf[strlen(buf)-1] = '\0'; /* suppress \n */

   fprintf (stderr, "%s? ", buf);

   if (ttyin() == 'y') {

    sscanf(buf, "%d", &pid);

    kill(pid, SIGKILL);

   }

  }

 exit(0);

}

#include "ttyin2.c"

#include "strindex.c"

#include "efopen.c"