linux - How does "cat << EOF" work in bash? - Stack Overflow
The cat <<EOF syntax is very useful when working with multi-line text in Bash, eg. when assigning multi-line string to a shell variable, file or a pipe. Examples of cat <<EOF syntax …
Is there replacement for cat on Windows - Stack Overflow
Sep 13, 2008 · Usage: cat file1 file2 file3 file4 -o output.txt -o | Specifies the next arg is the output, we must use this rather than ">>" to preserve the line endings I call it sharp-cat as its built with …
linux - How can I copy the output of a command directly into my ...
Feb 27, 2011 · cat file | xclip. Paste the text you just copied into a X application: xclip -o. To paste somewhere else other than an X application, such as a text area of a web page in a browser …
How does an SSL certificate chain bundle work? - Stack Overflow
Unix: cat cert2.pem cert1.pem root.pem > cert2-chain.pem Windows: copy /A cert1.pem+cert1.pem+root.pem cert2-chain.pem /A 2.2 Run this command. openssl verify …
LINUX Shell commands cat and grep - Stack Overflow
Jun 6, 2013 · cat countryInfo.txt reads the file countryInfo.txt and streams its content to standard output. | connects the output of the left command with the input of the right command (so the …
How do I read the first line of a file using cat? - Stack Overflow
May 24, 2011 · I'm surprised that this question has been around as long as it has, and nobody has provided the pre-mapfile built-in approach yet.
git - How do I access my SSH public key? - Stack Overflow
Sep 30, 2010 · On terminal cat ~/.ssh/id_rsa.pub. explanation. cat is a standard Unix utility that reads files and prints output ~ Is your Home User path /.ssh - your hidden directory contains …
linux - Retrieve last 100 lines logs - Stack Overflow
Aug 6, 2018 · You can simply use the following command:-tail -NUMBER_OF_LINES FILE_NAME. e.g tail -100 test.log. will fetch the last 100 lines from test.log
Convert categorical data in pandas dataframe - Stack Overflow
Aug 14, 2015 · First, to convert a Categorical column to its numerical codes, you can do this easier with: dataframe['c'].cat.codes. Further, it is possible to select automatically all columns …
Count the frequency that a value occurs in a dataframe column
I have a dataset category cat a cat b cat a I'd like to return something like the following which shows the unique values and their frequencies category freq cat a 2 cat b 1