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Unix is a multitasking, multi-user computer operating system originally developed in 1969 by a group of AT&T employees at Bell Labs.

1 vote

Unix: copy files sequentially

I'm not sure what you mean, that is the default behavior of the copy command (cp): Copy many files: cp *txt *jpg destination_dir Here are some examples of more complex operations: Copy all fil …
terdon's user avatar
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1 vote

Best way to edit certain system files without sudo

Another option is to open a new terminal and switch to root. Depending on how your system is set up you will be able to do this using one or more of the following ways: sudo su sudo -i su Once you …
terdon's user avatar
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11 votes

Single-line input to multiline output in Unix

Here's a couple: fold echo "Hello there" | fold -w 1 H e l l o t h e r e Perl echo "Hello there" | perl -pe 's/(.)/$1\n/g;' H e l l o t h e r e
terdon's user avatar
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1 vote

File rename in batch in Unix

If you want to rename many files, do something like this: for f in *Prd*;do mv "$f" "${f/Prd/Ppt}"; done This will go through all files whose name contains Prd in the current directory and rename t …
terdon's user avatar
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6 votes
Accepted

how can I sync Date time in two computers?

The best solution would be to install NTP on both machines and have them sync to the same server. This is not an option, of course, if you only have root access to one of the two. Assuming that you ha …
terdon's user avatar
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7 votes
Accepted

force copy when -i is used in bash alias

There are many ways of doing this (taken from here): the full pathname of the command: /bin/cp -f source_file dest_file command substitution: $(which cp) -f source_file dest_file the command builtin …
terdon's user avatar
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0 votes

extracting words using awk

I could give you a pure awk answer if you post an example of your actual data. In the absence of specific clues, you can always try Perl: perl -ne '/FG=(\d+)/; print "$1\n"' infile.txt > outfile.txt …
terdon's user avatar
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5 votes
Accepted

unix sytem-access

Um, yes. That's what group permissions are. The way you have it set up now is: d rwx rwx r-x - --- --- --- | | | |------> Everybody can read(r) and execute(x) | | | | | |----------> All gr …
terdon's user avatar
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1 vote

Adding default arguments to Google Chrome

Just make chrome an alias. Add this line to your ~/.bashrc (you can do similar things for other shells of course): alias chrome='chrome --auth-server-whitelist=*' Then either source ~/.bashrc or ju …
terdon's user avatar
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0 votes

How to map Alt+Tab behavior to another keyboard combination?

on the Unix machine edit the file ~/.config/xfce4/xfconf/xfce-perchannel-xml/xfce4-keyboard-shortcuts.xml and change this line: <property name="&lt;Alt&gt;Tab" type="string" value="cycle_windows_key"/ …
terdon's user avatar
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2 votes
Accepted

Replace string with another string shell script

I am sure you can also do this in sed but it is much easier for me in Perl: perl -pe 's/([^,])\"/$1xxx/g; s/xxx,/\",/g; s/xxx/\"\"\"/g' data.txt EXPLANATION: perl -pe : execute the script given o …
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2 votes

Is chmod 060/006/066/etc... useful?

You can always imagine possible scenarios. For example, 060 (group has read/write access and no one else can do anything) could be useful if you have a webserver creating a file but you don't want it …
terdon's user avatar
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0 votes

Executing multiple awk commands in one file

All you need is a one liner, no script file is necessary: awk '/FUELHH/{print > "fuelhh.txt"}/FUELINST/{print}' datafile > fuelinst.txt
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99 votes
Accepted

Understanding top command in unix

All this information is available in the top man page which you can read by running man top. Here is a breakdown: The CPU(s) row shows: CPU state percentages based on the interval since the last re …
terdon's user avatar
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3 votes

Filter file when a column is in whitelist

There are many ways of doing this. Here are a few but use the Perl one it is orders of magnitude faster. I include the others for the sake of completeness: Perl and hashes, ridiculously fast perl …
terdon's user avatar
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