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Bug 79864

Summary: echo error using pipe command
Product: [Retired] Red Hat Linux Reporter: Pat Norris <pnorris>
Component: syslinuxAssignee: Matt Wilson <msw>
Status: CLOSED NOTABUG QA Contact: Brock Organ <borgan>
Severity: medium Docs Contact:
Priority: medium    
Version: 7.3CC: mitr
Target Milestone: ---   
Target Release: ---   
Hardware: All   
OS: Linux   
Whiteboard:
Fixed In Version: Doc Type: Bug Fix
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Clone Of: Environment:
Last Closed: 2003-10-15 18:27:55 UTC Type: ---
Regression: --- Mount Type: ---
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oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
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Description Pat Norris 2002-12-17 16:48:46 UTC
Description of problem:
If you create a shell script with a read command and echo eg just:-
read ans1
echo $ans1

then run whatever name you've called it eg try1 and do :
try1 | less

the standard input on the read statement remains hidden (although it works!)

Version-Release number of selected component (if applicable):
2.4.18-18.8.0smp

How reproducible:
Consistently fails !

Steps to Reproduce:
1. run shell script as stated above
2.
3.
    
Actual results:

doesn't echo input

Expected results:

should echo input !

Additional info:
doesn't seem to be related to shell chosen (ie fails in csh and bash)
or dependant on an enviroment settings !

Comment 1 Miloslav Trmac 2002-12-18 16:46:19 UTC
That is right. less certainly doesn't want to show you your keystrokes,
so it disables echo. The terminal state is global, not per-process,
so echo is disabled for the shell script too.
To do what you probably want,
replace (the equivalent of) (read x; echo $x)|less
with read x; (echo $x |less)