Can I get some explanation around this bash redirection?
From what I have read, x < y means call the shell to redirect the output of y into x.
Does this mean that this sequence of commands is executed from right to left?
Code:
diff <(sort testfile.txt) <(sort testfile2.txt)
Thanks,
Moderator's Comments:
edit by bakunin: please use CODE-tags to surround code, data and terminal output. Thank you
Hello all. Is there a way to redirect output to more than one file at a time?
I have a method1() that writes to a logfile. In the method cksums are done on files by doing a
"for i in `ls`; do
cksum $i > $LOGFILE
done
"
In the logfile I want to show the cksums under each directory like... (2 Replies)
I came across the following problem, where file contents are overwritten using redirection. Can somebody please explain what cat << BAR seems to be doing and say why this is a problem? Explain the contents and relation between the two filenames used before the cat command. thanks
/tmp# echo... (2 Replies)
Hi,
in my script I need to execute the following command:
query $id 456 432
but it waits for a RETURN character from keyboard and therefore, it fails. I tried something like:
query $id 456 432 << '\n'
but, i'ts clear it is not correct. Is there any way to do this?
Thxs. (0 Replies)
Hi all,
I am working with the Grinder tool (unrelated to my question) to redirect the output of a program to a file as follows:
java -cp $CLASSPATH net.grinder.TCPProxy > grinder.txt
This is a proxy server which pipes output to a file. When I do something on my proxy, more and more goes to... (1 Reply)
Hi all,
Maybe someone is able to help:
Need to redirect the output of a command in realtime to a second command. Command-A executes a remote shell to another host, and outputs its results. Command-B displays a "dialog" with the outputs of Command-A.
Command-A Output:
Updating FileA... (2 Replies)
I just wondered if I'm understanding this command line correctly
cat 2>save1 0<memo | sort 2>save2 1>letter
This means that stdin will read from memo and if there is an error then stderr will write to save1. Am I correct in saying that the sort command will sort the memo file and write... (2 Replies)
for shell operators like <, >, <<, and >> do the LHS always have to be a process or device and the RHS a file or device?
Is it possible for the RHS to be a process? (1 Reply)
I want to redirect stderr and have the following peice of code
$ cat t1.ksh
#!/bin/ksh
func2()
{
diff /tmp/jdlkwjdlkejew /tmp/djlkwejdlewdjew >$OUTPUT_FILE 2>>$ERR_FILE
}
func1()
{
let counter=0
while
do
print -u2 "Error: In main function"
func2
let... (1 Reply)
Hi gurus,
I have a question, need some of your inputs...
I have a command like this :
export LINE_COUNT=`wc -l test.dat | awk '{print $1}'`
echo $LINE_COUNT --- > gives me 2 which is fine as the file has 2 lines.
This works fine if the file test.dat is present but in case... (3 Replies)
Hi,
when I try to redirect input and the command is described as a string within an array redirection does not work. why?
#!/bin/bash
dir=("tail < ./hello.txt")
tail < ./hello.txt #works
${dir} #does not work (2 Replies)
Discussion started by: heinzel
2 Replies
LEARN ABOUT DEBIAN
aps2file
APS2FILE(1) BSD General Commands Manual APS2FILE(1)NAME
aps2file -- printing to a file via apsfilter
SYNOPSIS
aps2file [-D] [-Pqueue] [-Zoptions] [-ooutput] [input]
aps2file [-h]
DESCRIPTION
With aps2file you can direct the printer data generated by apsfilter(1) into an arbitrary file without the use of a spooler.
OPTIONS -h show help screen
-D enable debug mode
-Pqueue select a printer queue (different from the default one)
-Zoptions use apsfilter command line options (comma-separated list)
-ooutput direct data stream to output (default: stdout)
input read data from input (default: stdin)
Unlike printing with lpr(1), you can only use one input file at a time.
Using aps2file is also the recommended way to create a debugging log of a failed printing attempt. If you include the -D flag, the apsfilter
shell script will log every command and print it to stderr. To save the output for inclusion into a bug report, you should therefore use a
command of the sort
aps2file -D -o /dev/null [-P...] [-Z...] [input] 2> log.txt
NOTES
aps2file only works correctly with entries in /etc/printcap that have been created by /usr/share/apsfilter/SETUP.
FILES
/etc/printcap printer capability data base
/usr/share/apsfilter/bin/apsfilter apsfilter script
SEE ALSO apsfilter(1), apsfilter-bug(1), apspreview(1), apsfilterrc(5), printcap(5)BUGS
See apsfilter software center - http://www.apsfilter.org/ - for new versions, bugfixes and known bugs.
Please use the new tool apsfilter-bug(1) to release bug- or problem reports. It automatically presents you a form in an editor window which
asks you some standard questions. If you save and quit the editor session, then this report is sent automatically via e-mail to the proper
apsfilter mailinglist.
If apsfilter fails to print something or prints it in a way you wouldn't expect and you want to report an apsfilter error then please save
the debugging output of one print session using the new aps2file(1) utility by typing aps2file -D -Z options file > /dev/null 2> file.debug
and including the debugging output in the file file.debug into the edit session of the apsfilter-bug utility, so that it is included into the
mail to the apsfilter mailinglist.
Please note that you need to run /bin/sh (Bourne Shell), bash or a compatible shell, so that the above mentioned output redirection works.
Under C-shell (/bin/csh) or tcsh it would't work. If you don't know, then simply make sure you use the Bournce shell by typing /bin/sh or
bash, then you should have no problems with redirection of stdout and stderr (> /dev/null 2> file.debug).
DOCUMENTATION
See official apsfilter homepage
http://www.apsfilter.org/handbook.html Apsfilter Handbook including the Frequently Asked Questions (FAQ)
USER FORUM
Please send questions to the official apsfilter help channel apsfilter-help@apsfilter.org. The above section BUGS and the file
HOWTO-BUGREPORTS tells you how to report bugs. If you want to know how to troubleshoot your apsfilter installation, please read the manpage
aps2file(1) and apsfilter-bug(1) as well as the Apsfilter Handbook carefully.
HISTORY
The aps2file manpage has been written by Michael LoBin <phallobst@web.de> and first appeared in apsfilter V 7.1.0.
BSD Dec 19, 2001 BSD
06-12-2019
