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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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RBASH(1)						      General Commands Manual							  RBASH(1)

NAME
rbash - restricted bash, see bash(1) RESTRICTED SHELL
If bash is started with the name rbash, or the -r option is supplied at invocation, the shell becomes restricted. A restricted shell is used to set up an environment more controlled than the standard shell. It behaves identically to bash with the exception that the follow- ing are disallowed or not performed: o changing directories with cd o setting or unsetting the values of SHELL, PATH, ENV, or BASH_ENV o specifying command names containing / o specifying a filename containing a / as an argument to the . builtin command o specifying a filename containing a slash as an argument to the -p option to the hash builtin command o importing function definitions from the shell environment at startup o parsing the value of SHELLOPTS from the shell environment at startup o redirecting output using the >, >|, <>, >&, &>, and >> redirection operators o using the exec builtin command to replace the shell with another command o adding or deleting builtin commands with the -f and -d options to the enable builtin command o using the enable builtin command to enable disabled shell builtins o specifying the -p option to the command builtin command o turning off restricted mode with set +r or set +o restricted. These restrictions are enforced after any startup files are read. When a command that is found to be a shell script is executed, rbash turns off any restrictions in the shell spawned to execute the script. SEE ALSO
bash(1) GNU Bash-4.0 2004 Apr 20 RBASH(1)
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