$ sed 's/original/replacement/g'
$ echo groad groadgroadgroad groad | sed 's/groad/GROAD/2g'
groad GROADGROADGROAD GROAD
$ echo groad groadgroadgroad groad | sed 's/groad/GROAD/3g'
groad groadGROADGROAD GROAD
$ echo groad groadgroadgroad groad | sed 's/groad/GROAD/4g'
groad groadgroadGROAD GROAD
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