Executing the result of a program as a shell script
I have a program that returns a shell script and I want to execute the script.
I'll use cat in my simple example, but wget is an example that is feasible.
Code:
$ # First setup a script
$ echo "ls
> df" > simple
$ # "cat simple" is now a program that returns a script
$ cat simple
ls
df
$
Now I want to execute the script returned from "cat simple". I am sure that there must be a way to do it, probably using nothing more than punctuation, but I haven't found it.
Code:
$ # This method works, but is ugly and needs write access to somewhere
$ cat simple > /tmp/somefile
$ . /tmp/somefile
< output of ls and df >
$ rm /tmp/somefile
$
$ # I want to do something like this:
$ `cat simple`
ls: cannot access df: No such file or directory
$ # Only it doesn't work
Does anyone have an idea of how to do this without writing to a temporary file?
Hi frnds...
I m facing very irritating problem already waisted my 2 days..
I have a following script..( i am pasting only the main code)
ftp -ivn 213.194.40.77 <<FTP
user $user $password
binary
cd $FileDir/out
lcd $localpath
get $file
rename $FileDir/out/$file $FileDir/tmp/$file... (1 Reply)
Hello all,
I do not understand the meaning of some columns in the result of executing 'ls -l'. For example, i got the following result by run 'ls -l'
total 3531
-rw-r--r-- 1 root root 1351680 Oct 17 20:50 fileindex.rpm
-rw-r--r-- 1 root root 16384 Oct 17 20:50 groupindex.rpm ... (5 Replies)
Could any one tell me how to do get result in fraction in shell script.
I am using expr for division of 2 number but it is giving Quitent.
I need it in full fraction value.
please helpp. how to do it using "dc" or "bc" (5 Replies)
Hi,
I'm curious about the advantage of forking and executing a program in a user shell as opposed to forking and executing the program directly without the user shell.
For example:
why is it often like:
SSHD->fork&exec(shell, sftp-server)->fork&exec(sftp-server)
And Not like:
... (2 Replies)
Hi,
I am looking for a cgi-script which runs a shell script from a web page.
When I click "Run" from a web page it should run the shell commands in an
textarea and results should get back to web page.
Thanks
Venkat (5 Replies)
there is a directory /data/users/osa/psidp/dmp/files/cimdir ,it have some subdirectories ,and also the subdirectoriy have it's subdirectoriis.
I want to get all the leaf nodes of the directory path .
but the result of the script is wrong ,how can i get the right result
somebody who can help... (1 Reply)
Hi,
I am writing a script on Solaris 10 and want to execute a remote ssh command. Normally this command should just return the value 0000000000002356 but when using ssh it seems it is passing the result to the shell to execute.
ssh root@10.5.112.145 `/usr/bin/nawk -F\, '$1=="USG" && $2=="01"... (3 Replies)
Hello,
I'm running a perl script to execute a program through my Unix command line. The program requires a user input but I want to automatically have perl input the string. Is there a way to do this?
Thanks (1 Reply)
Hi,
I wrote the below script to get the query result from a Syabase DB.
isql -s -U **** -P **** SYBASE SERVERNAME
USE ***(Database name in Sybase)
@command.sql
But im not getting the output. Can anyone help me on this (2 Replies)
Hi Team,
Can you pls advise in java how can we call a shell script, actly I have a shell script at the following location
/opt/dd/ajh.sh
now I can execute this script by opening the session through putty by entering the servers details and password and then navigating to the following... (2 Replies)
Discussion started by: punpun777777
2 Replies
LEARN ABOUT DEBIAN
unbuffer
UNBUFFER(1) General Commands Manual UNBUFFER(1)NAME
unbuffer - unbuffer output
SYNOPSIS
unbuffer program [ args ]
INTRODUCTION
unbuffer disables the output buffering that occurs when program output is redirected from non-interactive programs. For example, suppose
you are watching the output from a fifo by running it through od and then more.
od -c /tmp/fifo | more
You will not see anything until a full page of output has been produced.
You can disable this automatic buffering as follows:
unbuffer od -c /tmp/fifo | more
Normally, unbuffer does not read from stdin. This simplifies use of unbuffer in some situations. To use unbuffer in a pipeline, use the
-p flag. Example:
process1 | unbuffer -p process2 | process3
CAVEATS
unbuffer -p may appear to work incorrectly if a process feeding input to unbuffer exits. Consider:
process1 | unbuffer -p process2 | process3
If process1 exits, process2 may not yet have finished. It is impossible for unbuffer to know long to wait for process2 and process2 may
not ever finish, for example, if it is a filter. For expediency, unbuffer simply exits when it encounters an EOF from either its input or
process2.
In order to have a version of unbuffer that worked in all situations, an oracle would be necessary. If you want an application-specific
solution, workarounds or hand-coded Expect may be more suitable. For example, the following example shows how to allow grep to finish pro-
cessing when the cat before it finishes first. Using cat to feed grep would never require unbuffer in real life. It is merely a place-
holder for some imaginary process that may or may not finish. Similarly, the final cat at the end of the pipeline is also a placeholder
for another process.
$ cat /tmp/abcdef.log | grep abc | cat
abcdef
xxxabc defxxx
$ cat /tmp/abcdef.log | unbuffer grep abc | cat
$ (cat /tmp/abcdef.log ; sleep 1) | unbuffer grep abc | cat
abcdef
xxxabc defxxx
$
BUGS
The man page is longer than the program.
SEE ALSO
"Exploring Expect: A Tcl-Based Toolkit for Automating Interactive Programs" by Don Libes, O'Reilly and Associates, January 1995.
AUTHOR
Don Libes, National Institute of Standards and Technology
1 June 1994 UNBUFFER(1)