How to replace a string in shell script ? Posted on May 27, 2015 by coder STR="hello world" OUTPUT=`echo $STR | sed 's/hello/kutay/'` echo $OUTPUT # kutay world STR="hello kutay" OUTPUT=`echo $STR | sed 's/hello/zorlu/g'` echo $OUTPUT # zorlu kutay 123456789 STR="hello world"OUTPUT=`echo $STR | sed 's/hello/kutay/'`echo $OUTPUT# kutay world STR="hello kutay"OUTPUT=`echo $STR | sed 's/hello/zorlu/g'`echo $OUTPUT# zorlu kutay