why the pipe is used. ?

Mark Taylor · *nix forums Guru Wannabe Joined: 21 Feb 2005 Posts: 292

looks like your using a named pipe to compress data... I am making an
educated guess here as all the info is not in the bits you have posted.
i am assuming there is a function or script or homegrown binary called
write_ ?

i.e. this is used to take an export from a databse into an named pipe,
then compress the data from the named pipe into a compressed file ...
This allows you to export files larger than the filesystem can handle
as they are compressed on the fly through the pipe.

mkno ? thats a typo --> mknod = make node "p" = make pipe ( you can use
mkfifo )

HTH
Mark Taylor

tridentadm · *nix forums beginner Joined: 13 May 2005 Posts: 4

does anyone know why this pipe is used.. and what really is going on
in the below script.

read exp_cmp_pipe
echo "Attempt to remove $exp_comp_pipe"
echo 'Ignore "rm: cannot access $exp_cmp_pipe" error message'
rm $exp_cmp_pipe

mkno $exp_cmp_pipe p
echo "nohup compress < $exp_cmp_pipe > $filename.comp & " >
write_$exp_cmp_pipe
chmod +x write_$exp_cmp_pipe
write_$exp_cmp_pipe

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