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Top Forums Shell Programming and Scripting How do display a warning message? Post 302407221 by dunkar70 on Wednesday 24th of March 2010 09:40:06 PM
Old 03-24-2010
First, UNIX is case sensitive so the command is cd, not CD. You can type "man cd" to get the manual page for the command. Second, the decision to include a slash in your path is important. Starting a path with it denotes the root as the starting point and it denotes a full path. Ending the path with it denotes a directory, which is assumed when using the cd command. Trying to use the cd command with a file generate an error.

In short, cd can use relative paths or full paths.

Starting from the directory you listed:
Code:
/home/me/blah

you can type either of two commands to get to the "me" directory:
- Full path is always available regardless of the current working directory:
Code:
cd /home/me

- Relative path is only available if the current directory is the immediate child of the /home/me directory:
Code:
cd ../me

Both forms of the command have advantages and disadvantages. The decision to use one over the other depends on 1) if you know the full path, 2) if the script must be portable within a set of files and directories, and 3) if it makes sense.

Error/warning messages will automatically be displayed if you 1) try to cd into a file or 2) into a directory that does not exist.

Last edited by dunkar70; 03-24-2010 at 10:42 PM.. Reason: Adding clarity
 

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XTELL(1)						      General Commands Manual							  XTELL(1)

NAME
xtell - sends a message to another computer running xtelld SYNOPSIS
xtell [-v] [user[:tty][@host[:port]]] [message] write user [tty] DESCRIPTION
How to use it: suppose you want to send a message to user gubas on computer trener.fsport.uniba.sk Just type: prompt:~% xtell gubas@trener.fsport.uniba.sk Hi To send multiple lines long message to user 7tokarova at computer pascal.fmph.uniba.sk, type prompt:~% xtell 7tokarova@pascal.fmph.uniba.sk Hi How are you today Please answer ^D in this case, finish sending messages with EOF (CTRL D) If you want to send message to user holik on local computer, you can do it either by typing: prompt:~% xtell holik@localhost Hi or simply: prompt:~% xtell holik Hi To send message to certain tty, append the tty to username, separated by colon: prompt:~% xtell stanys:ttyp2@reaktor.ip.fmph.uniba.sk 'Sveikas Tomai' will send message 'Sveikas Tomai' to user stanys on ttyp2 at computer reaktor.ip.fmph.uniba.sk To specify other port than the default 4224, append the port to computer name, separated by colon: prompt:~% xtell bosa@radon.dnp.fmph.uniba.sk:4000 'Ahoj' assumes the xtell daemon runs at computer radon on port 4000, and sends the message 'Ahoj' to user bosa. Option -v turns verbose mode on. Xtell will then display some messgaes about connecting, which is usefull especially when the connection is slow. Example: prompt:~% xtell -v rybar@dmpc.dbp.fmph.uniba.sk xtell invoked without parameters will ask user for username and host to send the message to. If the user has created in his/her/its home directory the file .xtell-log, and the file is writable by nobody, all messages will be written to this file as well as to the screen (handy when the screen is overwritten and you could not see the message). xtell checks the environmental variable XTELLPROMPT. If it exists, it is used as prompt for messages. Last notice: if you do not think zsh is the best shell, (besides doing a mistake) replace prompt:~% in above text with prompt:~$ or what- ever :-) AUTHOR
Radovan Garabik (garabik@melkor.dnp.fmph.uniba.sk) SEE ALSO
xtelld(8), write(1), talk(1), talkd(8), tty(1) BUGS
What happens to .xtell-log when two messages arrive simultaneously? There is no locking implemented. XTELL(1)
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