Thread View: comp.unix.shell
3 messages
3 total messages
Started by FISH
Fri, 19 Oct 1990 13:01
Echo? What echo? Korn shell 88
Author: FISH
Date: Fri, 19 Oct 1990 13:01
Date: Fri, 19 Oct 1990 13:01
35 lines
1766 bytes
1766 bytes
I have recently discovered a problem with ksh88. The print command has a flag -s that allows you to place things into the history file, i.e. print -s Hello there will place "Hello there" in the history file. The manual claims that echo uses the echo program which means that echo -s should print the string -s. For reasons explained below this is the preferred behaviour. However, it would appear that echo has been aliased to print, even though the manual would claim that this is not the case and echo is /bin/echo like in the Bourne shell and earlier versions of the K shell. Has anyone had this problem and how did you crack it? alias -x echo /bin/echo dosen't work and gives an error neither does defining a function although you can do this without an error message. Background: I have been trying to write a simple training manual for users that has a worked example that uses the flag -s. This is to show some of the dangers in using test with things like [ -s = -s ], which works in n some implementations and not others. Unfortunately the way round it I discuss using `if echo $arg | grep -s -e -s' no longer works if echo -s dosen't send -s to stdout. I don't want to use the [[ ]] construct because we don't have ksh88 across the whole site, even though I recomend its use if available. Thanks in advance. Any ideas? Francis Fish Programmer / Analyst Liverpool University Computer Laboratory fish@uk.ac.liverpool
Re: Echo? What echo? Korn shell 88
Author: Jim Burns
Date: Sat, 20 Oct 1990 13:32
Date: Sat, 20 Oct 1990 13:32
12 lines
787 bytes
787 bytes
in article <90292.140155FISH@LIVERPOOL.AC.UK>, FISH@LIVERPOOL.AC.UK says:
> alias -x echo /bin/echo dosen't work and gives an error
It will if you include the '=':
alias -x echo=/bin/echo
--
BURNS,JIM
Georgia Institute of Technology, Box 30178, Atlanta Georgia, 30332
uucp: ...!{decvax,hplabs,ncar,purdue,rutgers}!gatech!prism!gt0178a
Internet: gt0178a@prism.gatech.edu
Re: Echo? What echo? Korn shell 88
Author: L. Mark Larsen
Date: Sat, 20 Oct 1990 20:03
Date: Sat, 20 Oct 1990 20:03
26 lines
1489 bytes
1489 bytes
In article <90292.140155FISH@LIVERPOOL.AC.UK>, FISH@LIVERPOOL.AC.UK writes: > I have recently discovered a problem with ksh88. The print command has a flag > -s that allows you to place things into the history file, i.e. > > print -s Hello there > > will place "Hello there" in the history file. The manual claims that echo > uses the echo program which means that echo -s should print the string -s. I tried this with ksh86, ksh88, ksh88e and "echo -s" prints "-s". Of course, it is possible that your version of ksh was compiled to exclude echo - it is an option afterall. If so, there might be an alias (poorly defined) for it in your environment. Try "alias echo" or "whence -v echo" to see. A proper alias for echo (if needed) is: alias echo='print -' The '-' ends the argument string for print so, with this alias, your attempt to do "echo -s" will work as expected. No need to call /bin/echo. > Thanks in advance. Any ideas? > > Francis Fish L. Mark Larsen lml@atlas.att.com
Thread Navigation
This is a paginated view of messages in the thread with full content displayed inline.
Messages are displayed in chronological order, with the original post highlighted in green.
Use pagination controls to navigate through all messages in large threads.
Back to All Threads