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sed -i  "/^$/ !s/^/`date +"%Y-%m-%d"`|/"

Runtime error #stdin #stdout #stderr 0.02s 4228KB

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s1
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stdout

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Standard output is empty

stderr

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gawk: prog.awk:1: sed -i  "/^$/ !s/^/`date +"%Y-%m-%d"`|/"
gawk: prog.awk:1:                               ^ syntax error

https://ideone.com/b5vTXe

language:

AWK (gawk 4.2.1)

created:

visibility:

public

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