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UNIX for Advanced & Expert Users
URGENT Help required regarding the use of FORK system call
Post 8123 by rwb1959 on Friday 5th of October 2001 05:15:12 PM
10-05-2001
The previous guru's are quite correct.
I might even suggest that you forget about fork(), wait(),
SIGCHLD, etc. and just launch 5 different instances of the
same program with say a file name as an argument...
#!/bin/ksh
myprog file1 > /tmp/file1.$$ &
kid1pid=$!
myprog file2 > /tmp/file2.$$ &
kid2pid=$!
....
myprog file5 > /tmp/file3.$$ &
kid5pid=$!
# at this point you wait on the kids
wait
# here you can assemble the files...
Cwd=`pwd`
cd /tmp
for i in `ls file?.*`
do
cat $i >> $Cwd/newfile.$$
done
rm -f file?.*
cd $Cwd
exit 0
...so... it ain't pretty, it ain't slick or elegant, hell, it ain't even C
but it is simple and will work by Monday
I might even suggest that you forget about fork(), wait(),
SIGCHLD, etc. and just launch 5 different instances of the
same program with say a file name as an argument...
#!/bin/ksh
myprog file1 > /tmp/file1.$$ &
kid1pid=$!
myprog file2 > /tmp/file2.$$ &
kid2pid=$!
....
myprog file5 > /tmp/file3.$$ &
kid5pid=$!
# at this point you wait on the kids
wait
# here you can assemble the files...
Cwd=`pwd`
cd /tmp
for i in `ls file?.*`
do
cat $i >> $Cwd/newfile.$$
done
rm -f file?.*
cd $Cwd
exit 0
...so... it ain't pretty, it ain't slick or elegant, hell, it ain't even C
but it is simple and will work by Monday
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LEARN ABOUT MOJAVE
zcmp
ZDIFF(1) BSD General Commands Manual ZDIFF(1) NAME
zcmp, zdiff -- compare compressed files SYNOPSIS
zcmp [options] file [file2] zdiff [options] file [file2] DESCRIPTION
zcmp and zdiff are filters that invoke cmp(1) or diff(1) respectively to compare compressed files. Any options that are specified are passed to cmp(1) or diff(1). If only file1 is specified, it is compared against a file with the same name, but with the extension removed. When both file1 or file2 are specified, either file may be compressed. Extensions handled by gzip(1): o z, Z, o gz, o taz, o tgz. Extensions handled by bzip2(1): o bz, o bz2, o tbz, o tbz2. Extensions handled by xz(1): o lzma, o xz, o tlz, o txz. ENVIRONMENT
TMPDIR Directory in which to place temporary files. If unset, /tmp is used. FILES
/tmp/zcmp.XXXXXXXXXX Temporary file for zcmp. /tmp/zdiff.XXXXXXXXXX Temporary file for zdiff. SEE ALSO
bzip2(1), cmp(1), diff(1), gzip(1), xz(1) CAVEATS
zcmp and zdiff rely solely on the file extension to determine what is, or is not, a compressed file. Consequently, the following are not supported as arguments: - directories - device special files - filenames indicating the standard input (``-'') BSD
May 23, 2011 BSD