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I have just started learning the Linux system and I need some help to translate the following to English:
grep WARNING readme.txt
and
grep WARNING readme.txt > warnings.txt
This is a homework question that i have researched myself but having trouble learning exactly what it means.
thanks in advance.
Try making a file on your computer named readme.txt. Put some lines of text in there, and make sure that some lines say "WARNING" while other lines do not.
Then run your first command and observe its output.
Then run your second command and observe its output and observe what was written to warnings.txt.
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Closed 2 years ago.
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I want to print the command line of the python process currently running on my machine, I tried things like this:
ps -A|grep python|awk "{cat /proc/$1/cmdline}"
but I seem unable to understand how awk works... I wanted a single line to make an alias, but you can suggest a better way
Thanks!
pgrep -af python
thaks to #Aaron and #markp-fuso for the help!
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Suppose I just don't have the whole file, I just download the first part and it contains all the file signature/magic bytes. Can I use file command in Linux to get its type? I think this command detect the file signature at the beginning, but I am not sure if they have more validation of the rest of the files.
file(1) will look by default at the first 1Mb of the file.
If you're using it as a library (libmagic) from your own program, you can change that with magic_setparam(MAGIC_PARAM_BYTES_MAX), see its manpage.
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Closed 6 years ago.
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I have used a command called 'cat /etc/group' what does this command mean and do.Can you tell me what each part of the command does please use simple terms.
You can find the answer to your question explained better than any of us ever could with this command:
man cat
It prints to standard output the contents of the file at the location /etc/group
Ok so cat outputs the file, which (in your case) contains basic info about groups.
If you are interested in what are the groups just click here
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I have this code but it is not compiling correctly. I want to create a user with a default shell of bin/sh with the group adults. Any suggestions?
Command: useradd -s /bin/sh –g adults michael
Thank you.
First of all the code given is not being compiled, but rather executed by a shell. Then your command is perfectly fine, given that the adults group already exists before you type the command into your shell.
So without error, or more context, nobody will be able to tell you more than what I'm telling you:
there's no issue with your command.
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Closed 8 years ago.
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I'm running Linux Mint 14 and accidentally replaced the contents of /etc/environment file. It was originally something like:
PATH=/usr/bin
but with some extra stuff. At the moment, most commands don't work in the terminal. If I do "ls", I get "command not found". Does anyone know the standard contents of this file is?
On ubuntu 12.04 it is:
PATH="/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/games"