Can linux cat command be used for writing text to

问题:

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...

回答1:

That's what echo does:

echo "Some text here." > myfile.txt

回答2:

Sounds like you're looking for a Here document

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

回答3:

Here's another way -

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

回答4:

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.

回答5:

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.

回答6:

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.

回答7:

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

回答8:

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 

回答9:

simply pipeline echo with cat

For example

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

回答10:

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

cat >file.txt <<< Write something here

回答11:

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