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- # simplest case
- cat <(echo "hello 1")
- # can have more than one
- cat <(echo "hello 2") <(echo "hello 3")
- # doesn't work in quotes
- echo "<(echo \"hello 0\")"
- # process substitution can be nested inside command substitution
- echo $(cat <(echo "hello 4"))
- # example from http://wiki.bash-hackers.org/syntax/expansion/proc_subst
- # process substitutions can be passed to a function as parameters or
- # variables
- f() {
- cat "$1" >"$x"
- }
- x=>(tr '[:lower:]' '[:upper:]') f <(echo 'hi there')
- # process substitution can be combined with redirection on exec
- rm -f err
- # save stderr
- exec 4>&2
- # copy stderr to a file
- exec 2> >(tee err)
- echo "hello error" >&2
- sync
- # restore stderr
- exec 2>&4
- cat err
- rm -f err
- echo "hello stderr" >&2
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