Configuration Information [Automatically generated, do not change]:
Machine: i486
OS: linux-gnu
Compiler: gcc
Compilation CFLAGS: -DPROGRAM='bash' -DCONF_HOSTTYPE='i486'
-DCONF_OSTYPE='linux-gnu' -DCONF_MACHTYPE='i486-pc-linux-gnu'
-DCONF_VENDOR='pc' -DLOCALEDIR='/usr/share/locale' -DPACKAGE='bash' -DSHELL
-DHAVE_CONFIG_H -I. -I../bash -I../bash/include -I../bash/lib -g -O2
uname output: Linux nuclear 2.6.15-1-686-smp #1 SMP Wed Jan 18 15:26:19 UTC
2006 i686 GNU/Linux
Machine Type: i486-pc-linux-gnu
Bash Version: 3.1
Patch Level: 14
Release Status: release
Description:
When Process substitution is used, BASH
reads from such descriptor by one bytes!!
Repeat-By:
--------------------------
/tmp/test:
--begin--
#!/bin/bash
while read line; do
qwe=qwe
done < <( cat /etc/passwd )
--end--
chmod +x /tmp/test
strace /tmp/test
--------------------------------------
You'll see that BASH read bytes from pipe one-by-one.
Another script will not trigger this problem:
#!/bin/bash
while read line; do
qwe=qwe
done < /etc/passwd
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