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gawk: iolint.awk:7: warning: `f1' used for input file and for output file
0
0
gawk: iolint.awk:16: warning: `echo hello' used for input file and two-way pipe
gawk: iolint.awk:17: warning: `echo hello' used for input pipe and two-way pipe
gawk: iolint.awk:17: warning: `echo hello' used for input file and input pipe
hello hello hello
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foo
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gawk: iolint.awk:30: warning: close: `cat' is not an open file, pipe or co-process
-1
gawk: iolint.awk:35: warning: unnecessary mixing of `>' and `>>' for file `f2'
0
gawk: iolint.awk:37: warning: close: `f2' is not an open file, pipe or co-process
-1
gawk: iolint.awk:42: warning: `echo hello' used for input pipe and output file
0
0
gawk: iolint.awk:53: warning: `cat' used for output file and output pipe
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hello
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gawk: iolint.awk:60: warning: `echo hello' used for input pipe and output pipe
hello
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0
gawk: iolint.awk:68: warning: `cksum' used for output file and output pipe
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