I wonder how bash does that! For ksh users, it comes and goes, and if it was easy to have all the time, I'd think David K would go that way. Using truss/tusc/strace, I see bash is managing named pipes for this (and too many /, no pipe cleanup? -- I just emailed the bash devs and DGK.):
I prefer the <() to the >(), as the latter spawns a background job with job id display and such. I am a big fan of pipeline parallelism, low latency through pipes and no scripted temp files to have name collisions and cleanup.
The named pipe is in the middle, nicer than temp files but demanding pre-creation and, hopefully, cleanup. Also, named pipes can persist with a left over process waiting in vain for a partner. They are more appropriate in a service paradigm.
Last edited by DGPickett; 03-24-2011 at 11:53 AM..
(and too many /, no pipe cleanup? -- I just emailed the bash devs and DGK.):
I can confirm, my /tmp directory here has dozens of sh-np-* files (I'm on version 3.2.16(1))
edit:
Yep found it: you can tell the bash devs in your email if you like:
There are a whole heap of calls to unlink_fifo_list(); in execute_cmd.c that need to have the test defined(HAVE_DEV_FD) changed to !defined(HAVE_DEV_FD)
Last edited by Chubler_XL; 03-24-2011 at 06:34 PM..
I referred them here -- why copy when you can point, eh?
Really, they also need to kill what has the pipe open, like:
Code:
kill -9 $(fuser pipe_path) 2>/dev/null
That might be more cleanup than the /dev/fd/# versions do, but cleanup is good.
Still, it'd be nice if all UNIX had fd in file tree, as I also get lots of mileage out of /dev/stdin, /dev/stderr and /dev/stdout, to get things back onto pipes or into one log with commands that have their heads in the file-no-pipe sand. I guess you can <(cat) or >(cat), but that is a waste and delay.
I have two directories
Dir 1
/home/sid/release1
Dir 2
/home/sid/release2
I want to find the common files between the two directories
Dir 1 files
/home/sid/release1>ls -lrt
total 16
-rw-r--r-- 1 sid cool 0 Jun 19 12:53 File123
-rw-r--r-- 1 sid cool 0 Jun 19 12:53... (5 Replies)
Hi All,
I have two files like below:
File1
MYFILE_28012012_1112.txt|4
MYFILE_28012012_1113.txt|51
MYFILE_28012012_1114.txt|57
MYFILE_28012012_1115.txt|57
MYFILE_28012012_1116.txt|57
MYFILE_28012012_1117.txt|57
File2
MYFILE_28012012_1110.txt|57
MYFILE_28012012_1111.txt|57... (2 Replies)
I have a file say "example.xml" and the contents of this example.xml are
<project name="platform/packages/wallpapers/Basic" path="packages/wallpapers/Basic" revision="225e410f054c4ad5c828b0fec9be1b47c4376711"/>
<project name="platform/packages/wallpapers/Galaxy4"... (3 Replies)
Hi all,
I'd like you to help or give any advise about the following:
I have two (2) files, file1 and file2, both files have information common to each other. The contents of file1 is a subset of the contents of file2:
file1:
errormsgadmin
esdp
esgservices
esignipa
iprice
ipvpn
irm... (0 Replies)
Hi ,
I have a text file in the format
DB2:
DB2:
WB:
WB:
WB:
WB:
and a second text file of the format
Time=00:00:00.473
Time=00:00:00.436
Time=00:00:00.016
Time=00:00:00.027
Time=00:00:00.471
Time=00:00:00.436
the last string in both the text files is of the... (4 Replies)
Hi ,
I want to write a simple script.
I have two files
file1:
BCSpeciality
Backend
CB
CBAPQualDisp
CBCimsVFTRCK
CBDSNQualDisp
CBDefault
CBDisney
CBFaxMCGen
CBMCGeneral
CBMCQualDisp
file2:
CSpeciality
Backend (8 Replies)
Hi, everyone,
Let's say, we have
xxx.txt
A 1 2 3 4 5
C 1 2 3 4 5
E 1 2 3 4 5
yyy.txt
A 1 2 3 4 5
B 1 2 3 4 5
C 1 2 3 4 5
D 1 2 3 4 5
E 1 2 3 4 5
First I match the first column I find intersection (A,C, E), then I want to take those lines with ACE out from yyy.txt, like
A 1... (11 Replies)
Hi,
I have one situation. I have some 6-7 no. of files in one directory & I have to extract all the lines which exist in all these files. means I need to extract all common lines from all these files & put them in a separate file.
Please help. I know it could be done with the help of... (11 Replies)
