UNIX — универсальная среда программирования

  cat $i

 esac

done

touch $HOME/.news_time

3.8.33 nohup

trap "" 1 15

if test -t 21

then

 echo "Sending output to 'nohup.out'"

 exec nice -5 $* nohup.out 21

else

 exec nice -5 $* 21

fi

3.8.34 older

# older f: list files older than f

ls -tr | sed '/^'$!'$/q'

3.8.35 overwrite1

# overwrite: copy standard input to output after EOF

# version 1. BUG here

PATH=/bin:/usr/bin

case $# in

1) ;;

*) echo 'Usage: overwrite file' 12; exit 2

esac

new=/tmp/overwr.$$

trap 'rm -f $new; exit 1' 1 2 15

cat $new # collect the input

cp $new $1 # overwrite the input file

rm -f $new

3.8.36 overwrite2

# overwrite: copy standard input to output after EOF

# version 2. BUG here too

PATH=/bin:/usr/bin

case $# in

1) ;;

*) echo 'Usage: overwrite file' 12; exit 2

esac

new=/tmp/overwr1.$$

old=/tmp/overwr2.$$

trap 'rm -f $new $old; exit 1' 1 2 15

cat $new # collect the input

cp $1 $old # save original file

trap '' 1 2 15 # we are committed; ignore signals

cp $new $1 # overwrite the input file

rm -f $new $old

3.8.37 overwrite3

# overwrite: copy standard input to output after EOF

# final version

opath=$PATH

PATH=/bin:/usr/bin

case $# in

0|1) echo 'Usage: overwrite file cmd [args]' 12; exit 2

esac

file=$1; shift

new=/tmp/overwr1.$$; old=/tmp/overwr2.$$

trap 'rm -f $new $old; exit 1' 1 2 15 # clean up files

if PATH=$opath $new # collect input

then

 cp $file $old # save original file

 trap '' 1 2 15 # we are committed; ignore signals

 cp $new $file

else

 echo "overwrite: $1 failed, $file unchanged" 12

 exit 1

fi

rm -f $new $old

3.8.38 p1.c

/* p: print input in chunks (version 1) */

#include stdio.h

#define PAGESIZE 22

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

main(argc, argv)

 int argc;

 char *argv[];

{

 int i;

 FILE *fp, *efopen;

 progname = argv[0];

 if (argc == 1)

  print(stdin, PAGESIZE);

 else

  for (i = 1; i argc; i++) {

   fp = efopen(argv[i], "r");

   print(fp, PAGESIZE);

   fclose(fp);

  }

  exit(0);

}

print(fp, pagesize) /* print fp in pagesize chunks */

 FILE *fp;

 int pagesize;

{

 static int lines = 0; /* number of lines so far */

 char buf[BUFSIZ];

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

  if (++lines pagesize)

   fputs(buf, stdout);

  else {

   buf[strlen(buf)-1] = '\0';

   fputs(buf, stdout);

   fflush(stdout);

   ttyin;

   lines = 0;

  }

}

#include "ttyin1.c"

#include "efopen.c"

3.8.39 p2.c

/* p: print input in chunks (version 2) */

#include stdio.h

#define PAGESIZE 22

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

main(argc, argv)

 int argc;

 char *argv[];

{

 FILE *fp, *efopen;

 int i, pagesize = PAGESIZE;

 progname = argv[0];

 if (argc 1 argv[1][0] == '-') {

  pagesize = atoi(argv[1][1]);

  argc--;

  argv++;

 }

 if (argc == 1)

  print(stdin, pagesize);