The difference isnt that bad, given the read its timeout is limited only to 2nd position of post decimal indicator.
Code:
#
# Testing simple
#
declare -a ARRAY
if [ "$1" = "" ]
then while read -t 0.01 ARG
do ARRAY[${#ARRAY[@]}]="$ARG"
done
else ARRAY=( "${@}" )
fi
#
# Parsing input
#
for item in "${ARRAY[@]}"
do echo "something with $item"
done
Code:
0 ~/tmp $ time ./get-pipe.sh *
something with browser
something with get-pipe.sh
something with get-pipe-test.sh
something with test with spaces
real 0m0.002s
user 0m0.001s
sys 0m0.001s
0 ~/tmp $ time ls | ./get-pipe.sh
something with browser
something with get-pipe.sh
something with get-pipe-test.sh
something with test with spaces
real 0m0.002s
user 0m0.003s
sys 0m0.001s
Thank you and hope this helps
---------- Post updated at 06:29 ---------- Previous update was at 06:04 ----------
Now i tried to remove the array, and shorten it a bit, now it behaves weird.
Code:
[ -z "$1" ] && \
while read ARG
do set "$ARG"
done
for item in "${@}"
do echo "something with $item"
done
Code:
0 ~/tmp $ ./get-pipe.sh *
something with browser
something with get-pipe.sh
something with get-pipe-test.sh
something with test with spaces
0 ~/tmp $ ls | ./get-pipe.sh
something with test with spaces
0 ~/tmp $
Even with while IFS="$IFS\l" read ARG there was no difference.
Any ideas please?
(edit: Or should i better stay with the array?)
Last edited by sea; 06-03-2015 at 01:34 AM..
Reason: Code fix
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Discussion started by: SkySmart
6 Replies
LEARN ABOUT MINIX
pipe
PIPE(2) System Calls Manual PIPE(2)NAME
pipe - create an interprocess communication channel
SYNOPSIS
#include <unistd.h>
int pipe(int fildes[2])
DESCRIPTION
The pipe system call creates an I/O mechanism called a pipe. The file descriptors returned can be used in read and write operations. When
the pipe is written using the descriptor fildes[1] up to PIPE_MAX bytes of data are buffered before the writing process is suspended. A
read using the descriptor fildes[0] will pick up the data.
PIPE_MAX equals 7168 under Minix, but note that most systems use 4096.
It is assumed that after the pipe has been set up, two (or more) cooperating processes (created by subsequent fork calls) will pass data
through the pipe with read and write calls.
The shell has a syntax to set up a linear array of processes connected by pipes.
Read calls on an empty pipe (no buffered data) with only one end (all write file descriptors closed) returns an end-of-file.
The signal SIGPIPE is generated if a write on a pipe with only one end is attempted.
RETURN VALUE
The function value zero is returned if the pipe was created; -1 if an error occurred.
ERRORS
The pipe call will fail if:
[EMFILE] Too many descriptors are active.
[ENFILE] The system file table is full.
[ENOSPC] The pipe file system (usually the root file system) has no free inodes.
[EFAULT] The fildes buffer is in an invalid area of the process's address space.
SEE ALSO sh(1), read(2), write(2), fork(2).
NOTES
Writes may return ENOSPC errors if no pipe data can be buffered, because the pipe file system is full.
BUGS
Should more than PIPE_MAX bytes be necessary in any pipe among a loop of processes, deadlock will occur.
4th Berkeley Distribution August 26, 1985 PIPE(2)
06-03-2015
