Recently I lost a number of changes I made to a program when the SCO Unix system went down. The system "mail" suggested a "vi -r" option that took me back several days. To prevent this in the future, I am trying to create my own vi command:
I put this in my home directory where my PATH in ".profile" is
When looking at my home directory from another login, I don't see the .bak file. What am I missing?
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I could use it after logging off and then back on. If this looks like it would be useful, change the first if to
If the file doesn't exist yet, there is nothing to back up.
The last if statement should be the same as the first one or just check for the presence of $1.bak .
I'm not sure what you think a PATH variable does. If a file has execute permissions (meaning you can run it by just typing the correct name of the file) then it can be run by typing the whole filename from anywhere
This is awkward if you have your current directory somewhere else. So. PATH allows you to put directories into the variable. Then when you type the name no matter where your current directory is set, the PATH looks up the file, then lets you run it.
Example after adding the directory where shell.sh lives to PATH:
Not delete it
Not write to it.
Just execute it.
The which command helps you figure out what file you will execute before you try to run it. Why? Well, in the example: shell.sh could be in several places. So if you type shell.sh you could be running another script by accident. PATH can be a cause of this.
makes the current directory part of the PATH. Dangerous.
Example: I use t.shl as a throwaway temporary filename. So it could be in any of the my own directories.
tells me which one will run when I type the command.
Last edited by jim mcnamara; 07-26-2018 at 10:37 PM..
which is from the csh.
The standard shell has type.
The ksh in SysV introduced whence.
I think the wrapper should cover all arguments
Unlike $* the "$@" can handle arguments with spaces. Some early shells have a bug, AFAIR the work-around was "${1+$@}"
Last but not least, I think the best backup is built into vi and vi -r is a good recovery.
This User Gave Thanks to MadeInGermany For This Post:
$@ muist be in quotes. Unquoted it will expand like $*
As a last exercise try
You see that unquoted the shell does a glob-expansion against the current directory. (That you can prevent with set -f)
Right now my script look like:
I realize vi can edit a number of files, start at a specific position, or after a search, but we seldom use any extra bells or whistles. Near the end of a Y2K conversion script, a vi searched for "-YEAR" in the command line, but that was 19 years ago.
Thanks for looking at it, I might revisit this thread and check for new ideas in the near future.
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I have then edited the /etc/profile and /etc/login.defs files and added :/mybin to all of the path variables. I have the file /mybin/mtp for... (2 Replies)
Hi all,
I have a variable test has the following value assigned.. could you please help on doing cd or ls to the value in the varible ...
$echo $test
/bdm/sdd/compounds/AD4833XT/requests/clin/Watson_20090420/docs/MHRA\ Comments\ \&\ Responses
$cd $test
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I want to basically check if my PATH variable already contains a certain path directory so I tried this (it didnt work!): if: Expression Syntax
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Hi
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hi ,
i have written csh script i am unable to set PATH variable in my script.
my script is like this
=====================================
# ! /bin/csh -f
setenv PATH "$PATH:/opt/terascan/bin"
ls -l > list
lspass > pas
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num_days = 1 \
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