# Iteration 22: Pipe stderr (|&)
# === Basic pipe stderr ===
=== simple pipe stderr
cmd |& cat
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(pipe (command (word "cmd") (redirect ">&" 1)) (command (word "cat")))
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=== pipe stderr with args
make 2>&1 |& tee build.log
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(pipe (command (word "make") (redirect ">&" 1) (redirect ">&" 1)) (command (word "tee") (word "build.log")))
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=== pipe stderr in chain
cmd1 |& cmd2 |& cmd3
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(pipe (command (word "cmd1") (redirect ">&" 1)) (pipe (command (word "cmd2") (redirect ">&" 1)) (command (word "cmd3"))))
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=== mixed pipe and pipe stderr
cmd1 | cmd2 |& cmd3
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(pipe (command (word "cmd1")) (pipe (command (word "cmd2") (redirect ">&" 1)) (command (word "cmd3"))))
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=== pipe stderr then regular pipe
cmd1 |& cmd2 | cmd3
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(pipe (command (word "cmd1") (redirect ">&" 1)) (pipe (command (word "cmd2")) (command (word "cmd3"))))
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=== pipe stderr from subshell
(cmd) |& cat
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(pipe (subshell (command (word "cmd"))) (redirect ">&" 1) (command (word "cat")))
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=== pipe stderr from brace group
{ cmd; } |& cat
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(pipe (brace-group (command (word "cmd"))) (redirect ">&" 1) (command (word "cat")))
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=== pipe stderr with if
if true; then echo x; fi |& cat
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(pipe (if (command (word "true")) (command (word "echo") (word "x"))) (redirect ">&" 1) (command (word "cat")))
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=== pipe stderr with while
while read line; do echo $line; done |& cat
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(pipe (while (command (word "read") (word "line")) (command (word "echo") (word "$line"))) (redirect ">&" 1) (command (word "cat")))
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=== pipe stderr in list
cmd |& cat && echo done
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(and (pipe (command (word "cmd") (redirect ">&" 1)) (command (word "cat"))) (command (word "echo") (word "done")))
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=== pipe stderr with redirect
cmd |& cat > output.txt
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(pipe (command (word "cmd") (redirect ">&" 1)) (command (word "cat") (redirect ">" "output.txt")))
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=== negated pipe stderr
! cmd |& cat
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(negation (pipe (command (word "cmd") (redirect ">&" 1)) (command (word "cat"))))
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=== time pipe stderr
time cmd |& cat
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(time (pipe (command (word "cmd") (redirect ">&" 1)) (command (word "cat"))))
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=== no spaces around pipe stderr
cmd|&cat
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(pipe (command (word "cmd") (redirect ">&" 1)) (command (word "cat")))
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=== pipe stderr newline before command
cmd |&
cat
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(pipe (command (word "cmd") (redirect ">&" 1)) (command (word "cat")))
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=== pipe stderr to subshell
cmd |& (cat)
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(pipe (command (word "cmd") (redirect ">&" 1)) (subshell (command (word "cat"))))
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=== pipe stderr to brace group
cmd |& { cat; }
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(pipe (command (word "cmd") (redirect ">&" 1)) (brace-group (command (word "cat"))))
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=== pipe stderr with process substitution input
diff <(cmd1) <(cmd2) |& cat
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(pipe (command (word "diff") (word "<(cmd1)") (word "<(cmd2)") (redirect ">&" 1)) (command (word "cat")))
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=== pipe stderr to process substitution
cmd |& tee >(cat)
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(pipe (command (word "cmd") (redirect ">&" 1)) (command (word "tee") (word ">(cat)")))
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=== backgrounded pipeline with pipe stderr
cmd |& cat &
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(background (pipe (command (word "cmd") (redirect ">&" 1)) (command (word "cat"))))
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=== for loop with pipe stderr
for x in a b; do echo $x; done |& cat
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(pipe (for (word "x") (in (word "a") (word "b")) (command (word "echo") (word "$x"))) (redirect ">&" 1) (command (word "cat")))
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=== case with pipe stderr
case x in y) echo z;; esac |& cat
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(pipe (case (word "x") (pattern ((word "y")) (command (word "echo") (word "z")))) (redirect ">&" 1) (command (word "cat")))
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=== arithmetic command with pipe stderr
((x++)) |& cat
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(pipe (arith (word "x++")) (redirect ">&" 1) (command (word "cat")))
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=== conditional expression with pipe stderr
[[ -f file ]] |& cat
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(pipe (cond (cond-unary "-f" (cond-term "file"))) (redirect ">&" 1) (command (word "cat")))
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=== coproc with pipe stderr in body
coproc { cmd |& cat; }
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(coproc "COPROC" (brace-group (pipe (command (word "cmd") (redirect ">&" 1)) (command (word "cat")))))
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=== function with pipe stderr in body
f() { cmd |& cat; }
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(function "f" (brace-group (pipe (command (word "cmd") (redirect ">&" 1)) (command (word "cat")))))
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