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I am trying to implement a linux shell that supports piping. I have already done simple commands, commands running in background, redirections, but piping is still missing.
I have already read about it and seen some snippets of code, but still haven't been able to sort out a working solution.
What…
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Hello,
To illustrate my problem,
TEST="Hi my name is John"
OUTP=`echo $TEST | awk '{print $3}'`
echo $OUTP
What I would expect this to do is pass the $TEST variable into awk and store the 3rd word into $OUTP.
Instead I get "Hi: not found", as if it is expecting the input to be a file. If I…
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I am having trouble piping through sed. Once I have piped output to sed, I cannot pipe the output of sed elsewhere.
wget -r -nv http://127.0.0.1:3000/test.html
Outputs:
2010-03-12 04:41:48 URL:http://127.0.0.1:3000/test.html [99/99] -> "127.0.0.1:3000/test.html" [1]
2010-03-12 04:41:48 URL:http://127…
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Lets say within my program I want to execute two child processes, one to to execute a "ls -al" command and then pipe that into "wc" command and display the output on the terminal. How can I do this using pipe file descriptors so far the code I have written: An example would be greatly helpful
int…
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Ok, so I can print a pdf doing:
pdf2ps file.pdf - | lp -s
But now I want to use convert to merge several pdf files, I can do this with:
convert file1.pdf file2.pdf merged.pdf
which merges file1.pdf and file2.pdf into merged.pdf, target can be replaced with '-'.
Question
How could I pipe convert…
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Is it possible to do the following using 1 polkit .pkla file?
Disable all users except those in the wheel group from using polkit.
The users in the wheel group will need to provide the root password when using polkit.
/etc/polkit-1/localauthority/50-local.d/wheel-only.pkla
[disable all users…
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I have a process (dbus-daemon) which has many open connection over UNIX sockets. One of these connections is fd #36:
=$ ps uw -p 23284
USER PID %CPU %MEM VSZ RSS TTY STAT START TIME COMMAND
depesz 23284 0.0 0.0 24680 1772 ? Ss 15:25 0:00 /bin/dbus-daemon --fork…
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I've been using Linux for a couple of years now but I still haven't figured out what the origin or meaning of some the directory names are on Unix and Unix like systems. E.g. what does etc stand for or var? Where does the opt name come from?
And while we're on the topic anyway. Can someone give a…
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Hi All,
I am beginner to UNIX,UNIX Shell Scripting.
Can you please guide me through any excellent sites for unix(which are easy to understand),some study materials(tutorials),video tutorials.
Please help!!
Thanks!
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Is Mac OS X developed on a licensed Unix or is it a Unix-like clone that, unlike Linux, conforms to Unix specification well enough to be registered as a Unix OS. Not until Leopard, Mac OS X did not gain the Unix certification. But in Leopard, Terminal still print:
GNU bash, version 3.2.48(1)-release…
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