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Bash
#!/bin/bash taceval `tac $0 | head -n 4 | xargs -i sh -c 4` "eval&& {}" exit echo 'Line1' ; echo 'Line2' ; echo 'Line3' ; echo 'Line4' ;
Output:
Line4 Line3 Line2 Line1
#!/bin/bash tac $0 | head -n 4 | xargs -i sh -c "eval {}" exit echo 'Line1' echo 'Line2' echo 'Line3' echo 'Line4'
#!/bin/bash eval `tac $0 | head -n 4` && exit echo 'Line1' ; echo 'Line2' ; echo 'Line3' ; echo 'Line4' ;
The first line of this program causes it to run the last four lines backwards:
#!/bin/bash tac $0 | head -n 4 | xargs -i sh -c "eval {}" 2>/dev/null exit echo 'Line1' echo 'Line2' echo 'Line3' echo 'Line4'
#!/bin/bash tac $0 | xargs -i sh -c "eval {}" 2>/dev/null exit echo 'Line1' echo 'Line2' echo 'Line3' echo 'Line4'
