Concatenate strings, files and program output in Bash

This works:

cat 1.css <(echo "FOO") <(sed ...) 2.css <(echo "BAR")

bash concatenation stdout

You can add all the commands in a subshell, which is redirected to a file:

(    cat 1.css    echo "FOO"    sed ...    echo BAR    cat 2.css) > output

You can also append to a file with >>. For example:

cat 1.css  >  outputecho "FOO" >> outputsed ...    >> outputecho "BAR" >> output cat 2.css  >> output

(This potentially opens and closes the file repeatedly)

bash concatenation stdout

You can do:

echo "$(command 1)" "$(command 2)" ... "$(command n)" > outputFile

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