Hi, I am new to Unix/Linux...
I have a TCSH shell script (on AIX4) in which, at a certain point, I want the user to be able to pass commands to the TCSH interpreter. What I do is I create the illusion that the user is at his usuall shell prompt :
echo -n `whoami`"> ";
set cmdinput = "$<";
After reading the standard input from key board, I want to "execute" within the shell, the command typed by user. Note that I run my script with >source myscript.tcsh to ensure it running from the current shell (unlike >tcsh myscript.tcsh). For the purpose of this post lets say I would like the user to be able to run the following 8 commands, the first three are from Unix while the last 5 are TCSH built-in (will use -> to denote what I would like the shell to return) :
>pwd -> /usr
>ps -> PID TTY TIME CMD
23200 pts/1 0:00 ps
28346 pts/1 0:00 -tcsh
>ps -l -> F S UID PID PPID C PRI NI ADDR SZ WCHAN TTY TIME CMD
200001 A 384 25598 28346 1 60 20 ee3 256 pts/1 0:00 ps
240001 A 384 28346 30552 1 60 20 4f0b 1112 pts/1 0:00 tcsh"
>set x=10 ->
>echo "x is" -> x is
>echo $x -> 10
>alias p pwd ->
>alias | grep pwd -> p pwd
>p -> /usrSo here are the 4 diffrent attemps to executes those commands with their respective output (will use -> to denote what the shell actually returns) :
$cmdinput;
>pwd -> /usr
>ps -> PID TTY TIME CMD
23200 pts/1 0:00 ps
28346 pts/1 0:00 -tcsh
>ps -l -> F S UID PID PPID C PRI NI ADDR SZ WCHAN TTY TIME CMD
200001 A 384 25598 28346 1 60 20 ee3 256 pts/1 0:00 ps
240001 A 384 28346 30552 1 60 20 4f0b 1112 pts/1 0:00 tcsh"
>set x=10 ->
>echo "x is" -> "x is"
>echo $x -> $x
>alias p pwd ->
>alias | grep pwd -> : Command not found.
>p -> p: Command not found.Result : The first 3 commands work even thoe the 3rd one has a space in it. The set command works, I confirmed by reading x afterwords, but 5th command returned unwated quotes and the lase one returned $x istead of its value. No succes with setting, reading or using alias.
`$cmdinput`;
>pwd -> /usr: Permission denied
>ps -> PID: Command not found.
>ps -l -> F: Command not found
>set x=10 -> : Command not found.
>echo "x is" -> "x: Command not found.
>echo $x -> $x: Command not found.
>alias p pwd -> : Command not found.
>alias | grep pwd -> : Command not found.
>p -> p: Command not found.
: Command not found.Result : Instead of outputting the result of the commands, it tried to run the results of the commands as if themselves were commands. No succes with setting, reading or using alias.
`echo $cmdinput`;
>pwd -> /usr
>ps -> PID TTY TIME CMD
23200 pts/1 0:00 ps
28346 pts/1 0:00 -tcsh
>ps -l -> F S UID PID PPID C PRI NI ADDR SZ WCHAN TTY TIME CMD
200001 A 384 25598 28346 1 60 20 ee3 256 pts/1 0:00 ps
240001 A 384 28346 30552 1 60 20 4f0b 1112 pts/1 0:00 tcsh"
>set x=10 -> set: Command not found.
>echo "x is" -> "x is"
>echo $x -> $x
>alias p pwd -> p: alias not found
pwd: alias not found
>alias | grep pwd -> /usr/bin/alias[53]: |: invalid alias name
>p -> p: Command not found.Result : The first 3 commands work even thoe the 3rd one has a space in it. The set command did not work even though it is shell built-in. 5th command returned unwated quotes and the lase one returned $x istead of its value (it was still set to 10 from previous attempt). No succes with setting, reading or using alias.
`echo "$cmdinput"`
>pwd -> /usr
>ps -> PID TTY TIME CMD
23200 pts/1 0:00 ps
28346 pts/1 0:00 -tcsh
>ps -l -> F S UID PID PPID C PRI NI ADDR SZ WCHAN TTY TIME CMD
200001 A 384 25598 28346 1 60 20 ee3 256 pts/1 0:00 ps
240001 A 384 28346 30552 1 60 20 4f0b 1112 pts/1 0:00 tcsh"
>set x=10 -> set: Command not found.
>echo "x is" -> "x is"
>echo $x -> $x
>alias p pwd -> p: alias not found
pwd: alias not found
>alias | grep pwd -> /usr/bin/alias[53]: |: invalid alias name
>p -> p: Command not found.Result : Exactly the same as previous attempt.
Over all, I feel like my first attemps ($cmdinput;) is the closest even though I was not able to echo the value of a variable...
Any help is appreciated.