Can Linux Cat Command Be Used for Writing Text to File?

Sounds like you're looking for a Here document

cat > outfile.txt <<EOF
>some text
>to save
>EOF

Here's another way -

cat > outfile.txt
>Enter text
>to save press ctrl-d

For text file:

cat > output.txt <<EOF
some text
some lines
EOF

For PHP file:

cat > test.php <<PHP
<?php
echo "Test";
echo \$var;
?>
PHP

I use the following code to write raw text to files, to update my CPU-settings. Hope this helps out! Script:

#!/bin/sh

cat > /sys/devices/system/cpu/cpu0/cpufreq/scaling_governor <<EOF
performance
EOF

cat > /sys/devices/system/cpu/cpu1/cpufreq/scaling_governor <<EOF
performance
EOF

This writes the text "performance" to the two files mentioned in the script above. This example overwrite old data in files.

This code is saved as a file (cpu_update.sh) and to make it executable run:

chmod +x cpu_update.sh

After that, you can run the script with:

./cpu_update.sh

IF you do not want to overwrite the old data in the file, switch out

cat > /sys/devices/system/cpu/cpu1/cpufreq/scaling_governor <<EOF

with

cat >> /sys/devices/system/cpu/cpu1/cpufreq/scaling_governor <<EOF

This will append your text to the end of the file without removing what other data already is in the file.

cat > filename.txt

enter the text until EOF for save the text use : ctrl+d

if you want to read that .txt file use

cat filename.txt

and one thing .txt is not mandatory, its for your reference.

You can do it like this too:

user@host: $ cat<<EOF > file.txt
$ > 1 line
$ > other line
$ > n line
$ > EOF
user@host: $ _

I believe there is a lot of ways to use it.

Write multi-line text with environment variables using echo:

echo -e "
Home Directory: $HOME \n
hello world 1 \n
hello world 2 \n
line n... \n
" > file.txt 

Another way to write text to file using cat would be something like this

cat >file.txt <<< Write something here

The Solution to your problem is :

echo " Some Text Goes Here " > filename.txt

But you can use cat command if you want to redirect the output of a file to some other file or if you want to append the output of a file to another file :

cat filename > newfile -- To redirect output of filename to newfile

cat filename >> newfile -- To append the output of filename to newfile

simply pipeline echo with cat

For example

echo write something to file.txt | cat > file.txt

cat can also be used following a | to write to a file, i.e. pipe feeds cat a stream of data

For my Jenkins on MacOS 11.4

{
   echo 'line 1' $var1
   echo 'line 2'
   echo 'result' $var5

} > ${destination_file}

I had tried many times by cat syntax, ex: cat > ${dest_file} <<EOF ... EOF, and got error syntax error: unexpected end of file. So, I use echo syntax to output multi-lines text to a file.

References:

• How to append multiple lines to a file