gawk: noeffect.awk:2: warning: statement has no effect
gawk: noeffect.awk:3: warning: statement has no effect
gawk: noeffect.awk:5: warning: statement has no effect
gawk: noeffect.awk:6: warning: statement has no effect
gawk: noeffect.awk:7: warning: statement has no effect
gawk: noeffect.awk:9: warning: statement has no effect
gawk: noeffect.awk:13: warning: statement has no effect
gawk: noeffect.awk:14: warning: statement has no effect
gawk: noeffect.awk:2: warning: reference to uninitialized variable `s'
gawk: noeffect.awk:3: warning: reference to uninitialized variable `s'