ken@boring.UUCP (06/04/85)
A quick hack I wrote a few years back. For example, I sort my .newsrc
file thus:
alias sortn '( fgrep : ~/.newsrc | sort ; fgrep -v : ~/.newsrc | sort ) | hold ~/.newsrc'
Runs on 4.2. Some mods may be needed for other systems.
#!/bin/sh
# This is a shell archive, meaning:
# 1. Remove everything above the #!/bin/sh line.
# 2. Save the resulting text in a file.
# 3. Execute the file with /bin/sh (not csh) to create the files:
# hold.1
# hold.c
# This archive created: Mon Jun 3 15:22:51 1985
# By: Ken Yap ()
export PATH; PATH=/bin:$PATH
if test -f 'hold.1'
then
echo shar: over-writing existing file "'hold.1'"
fi
cat << \SHAR_EOF > 'hold.1'
.TH HOLD 1 "26/4/85"
.SH NAME
hold \- collect standard input into a file
.SH SYNOPSIS
.B "hold file"
.SH DESCRIPTION
.I Hold
collects standard input and writes it to the file.
The difference between it and
.I > or tee
is that the file
does not exist by that name until EOF is seen.
This is useful for putting the results of pipelines
back into the original file.
If
.I hold
is interrupted the temporary file is deleted.
.SH EXAMPLES
tr 'A-Z' 'a-z' < prog | hold prog
.SH AUTHOR
Ken Yap ( University of Sydney )
.SH FILES
holdXXXXXX temporary
.SH SEE ALSO
tee(1)
SHAR_EOF
if test -f 'hold.c'
then
echo shar: over-writing existing file "'hold.c'"
fi
cat << \SHAR_EOF > 'hold.c'
/*
** hold - program to copy standard input into a file
** and rename it to the first argument after end of file
** useful for putting output of programs like tr back
** into the original file
** Ken Yap, Sydney University, March 1982.
*/
#include <stdio.h>
#include <signal.h>
char tmpname[64];
char buffer[BUFSIZ];
main(argc,argv)
int argc;
char **argv;{
if(argc < 2){
fprintf(stderr,"Usage: %s file\n",argv[0]);
exit(1);
}
hold(argv[1]);
exit(0);
}
hold(name)
char *name;{
register char *p;
register int length,fd;
int (*oldsig)();
char *mktemp(),*rindex();
int read(),write(),link();
extern catch();
(int (*)()) signal();
if((p = rindex(name,'/')) == NULL)
length = 0;
else
length = p - name + 1;
strncpy(tmpname,name,length);
strcpy(tmpname + length,mktemp("holdXXXXXX"));
#ifdef DEBUG
fprintf(stderr,"tmpname is %s\n",tmpname);
#endif
if((oldsig = signal(SIGINT,SIG_IGN)) == SIG_DFL)
signal(SIGINT,catch);
#ifdef DEBUG
fprintf(stderr,"oldsig is %d\n",oldsig);
#endif
if((fd = creat(tmpname,0644)) < 0){
perror(name);
exit(2);
}
while((length = read(0,buffer,BUFSIZ)) > 0)
write(fd,buffer,length);
close(fd);
signal(SIGINT,SIG_IGN);
unlink(name);
if(link(tmpname,name) < 0){
perror(name);
exit(3);
}
unlink(tmpname);
}
catch(){
unlink(tmpname);
exit(0);
}
SHAR_EOF
# End of shell archive
exit 0
--
UUCP: ..!{seismo,okstate,garfield,decvax,philabs}!mcvax!ken Voice: Ken!
Mail: Centrum voor Wiskunde en Informatica, Kruislaan 413, 1098 SJ, Amsterdam.