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error handling

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s2c.sh

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`‎s2c.sh‎`

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Original file line number	Diff line number	Diff line change
`@@ -16,6 +16,11 @@ EOS`
`16`	`16`	`exit 1`
`17`	`17`	`fi`
`18`	`18`
	`19`	`+if [ ! -f "$sketch" ]`
	`20`	`+then`
	`21`	`+ echo "$sketch is not found"`
	`22`	`+ exit 1`
	`23`	`+fi`
`19`	`24`
`20`	`25`	`if [[ $(file -b "$sketch") != 'PNG '* ]]`
`21`	`26`	`then`

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