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Full Discussion: Output of sed command to another sed command
Top Forums UNIX for Dummies Questions & Answers Output of sed command to another sed command Post 302878250 by hergp on Thursday 5th of December 2013 08:22:57 AM
Old 12-05-2013
I dug into this a little bit more, and it seems, it depends on your shell, if you need a blank as RudiC suggested or not.

First with bash:
Code:
$ bash -c "sed '1i\' <(sed -n 1,2p file1) file2"
head1
head2
line1
line2
line3
$ bash -c "sed '1i\'<(sed -n 1,2p file1) file2"
/dev/fd/63
line1
line2
line3

Without the blank you get the line with /dev/fd/nnn as BigCroyd pointed out.

Whereas ksh does not seem to care
Code:
$ ksh -c "sed '1i\' <(sed -n 1,2p file1) file2"
head1
head2
line1
line2
line3
$ ksh -c "sed '1i\'<(sed -n 1,2p file1) file2"
head1
head2
line1
line2
line3

---------- Post updated at 14:22 ---------- Previous update was at 14:18 ----------

Quote:
Originally Posted by BigCroyd
Code:
$ sed '1i\' <(sed -n 1,2p file1) file2
sed: couldn't write -1 items to stdout: Success

... and another version... Smilie

This syntax does not seem to be very advisable with all these different outcomes. I withdraw my original example.
 

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bashbug

BASHBUG(1)						      General Commands Manual							BASHBUG(1)

NAME

       bashbug - report a bug in bash

SYNOPSIS

       bashbug [--version] [--help] [email-address]

DESCRIPTION

       bashbug	is  a shell script to help the user compose and mail bug reports concerning bash in a standard format.	bashbug invokes the editor
       specified by the environment variable EDITOR on a temporary copy of the bug report format outline. The user must fill  in  the  appropriate
       fields  and  exit  the  editor.	 bashbug  then	mails the completed report to bug-bash@gnu.org, or email-address.  If the report cannot be
       mailed, it is saved in the file dead.bashbug in the invoking user's home directory.

       The bug report format outline consists of several sections.  The first section provides information about the  machine,	operating  system,
       the  bash  version, and the compilation environment.  The second section should be filled in with a description of the bug.  The third sec-
       tion should be a description of how to reproduce the bug.  The optional fourth section is for a proposed fix.  Fixes are encouraged.

ENVIRONMENT

       bashbug will utilize the following environment variables if they exist:

       EDITOR Specifies the preferred editor. If EDITOR is not set, bashbug defaults to emacs.

       HOME   Directory in which the failed bug report is saved if the mail fails.

       TMPDIR Directory in which to create temporary files and directories.

SEE ALSO

       bash(1)

AUTHORS

       Brian Fox, Free Software Foundation
       bfox@gnu.org

       Chet Ramey, Case Western Reserve University
       chet@po.cwru.edu

GNU Bash-4.0							   1998 July 30 							BASHBUG(1)
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