Can linux cat command be used for writing text to file?
Question
Is something like this:
cat "Some text here." > myfile.txt
Possible? Such that the contents of myfile.txt would now be overwritten to:
Some text here.
This doesn't work for me, but also doesn't throw any errors.
Specifically interested in a cat-based solution (not vim/vi/emacs, etc.). All examples online show cat used in conjunction with file inputs, not raw text...
Popular Answer
Sounds like you're looking for a Here document
cat > outfile.txt <<EOF
>some text
>to save
>EOF
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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.
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
You can do it like this too:
[email protected]: $ cat<<EOF > file.txt
$ > 1 line
$ > other line
$ > n line
$ > EOF
[email protected]: $ _
I believe there is a lot of ways to use it.