How to cat <> a file containing code?

问题:

I want to print code into a file using cat <<EOF >>:

cat <<EOF >> brightup.sh
!/bin/bash
curr=`cat /sys/class/backlight/intel_backlight/actual_brightness`
if [ $curr -lt 4477 ]; then
   curr=$((curr+406));
   echo $curr  > /sys/class/backlight/intel_backlight/brightness;
fi
EOF

but when I check the file output, I get this:

!/bin/bash
curr=1634
if [  -lt 4477 ]; then
   curr=406;
   echo   > /sys/class/backlight/intel_backlight/brightness;
fi

I tried putting single quotes but the output also carries the single quotes with it. How can I avoid this issue?

回答1:

You only need a minimal change; single-quote the here-document delimiter after <<.

cat <<\'EOF\' >> brightup.sh

or equivalently backslash-escape it:

cat <<\\EOF >>brightup.sh

Without quoting, the here document will undergo variable substitution, backticks will be evaluated, etc, like you discovered.

If you need to expand some, but not all, values, you need to individually escape the ones you want to prevent.

cat <<EOF >>brightup.sh
#!/bin/sh
# Created on $(date # : <<-- this will be evaluated before cat;)
echo \"\\$HOME will not be evaluated because it is backslash-escaped\"
EOF

will produce

#!/bin/sh
# Created on Fri Feb 16 11:00:18 UTC 2018
echo \"$HOME will not be evaluated because it is backslash-escaped\"

As suggested by @fedorqui, here is the relevant section from man bash:

Here Documents

This type of redirection instructs the shell to read input from the current source until a line containing only delimiter (with no trailing blanks) is seen. All of the lines read up to that point are then used as the standard input for a command.

The format of here-documents is:

      <<[-]word
              here-document
      delimiter

No parameter expansion, command substitution, arithmetic expansion, or pathname expansion is performed on word. If any characters in word are quoted, the delimiter is the result of quote removal on word, and the lines in the here-document are not expanded. If word is unquoted, all lines of the here-document are subjected to parameter expansion, command substitution, and arithmetic expansion. In the latter case, the character sequence \\ is ignored, and \\ must be used to quote the characters \\, $, and `.

回答2:

Or, using your EOF markers, you need to quote the initial marker so expansion won\'t be done:

#-----v---v------
cat <<\'EOF\' >> brightup.sh
#!/bin/bash
curr=`cat /sys/class/backlight/intel_backlight/actual_brightness`
if [ $curr -lt 4477 ]; then
   curr=$((curr+406));
   echo $curr  > /sys/class/backlight/intel_backlight/brightness;
fi
EOF

IHTH

回答3:

This should work, I just tested it out and it worked as expected: no expansion, substitution, or what-have-you took place.

cat <<< \'
#!/bin/bash
curr=`cat /sys/class/backlight/intel_backlight/actual_brightness`
if [ $curr -lt 4477 ]; then
  curr=$((curr+406));
  echo $curr  > /sys/class/backlight/intel_backlight/brightness;
fi\' > file # use overwrite mode so that you don\'t keep on appending the same script to that file over and over again, unless that\'s what you want. 

Using the following also works.

cat <<< \' > file
 ... code ...\'

Also, it\'s worth noting that when using heredocs, such as << EOF, substitution and variable expansion and the like takes place. So doing something like this:

cat << EOF > file
cd \"$HOME\"
echo \"$PWD\" # echo the current path
EOF

will always result in the expansion of the variables $HOME and $PWD. So if your home directory is /home/foobar and the current path is /home/foobar/bin, file will look like this:

cd \"/home/foobar\"
echo \"/home/foobar/bin\"

instead of the expected:

cd \"$HOME\"
echo \"$PWD\"