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- # (1)
- tail -n +23 file.txt | head -n 1
- sed -n '23p' file.txt
- awk 'NR==23' file.txt
- # (2)
- awk '{for(i=1;i<=NF;i++) num[$i]++;} END{ for(k in num) print k" "num[k]}' file.txt | sort -rnk 2
- # (3)
- #!/bin/bash
- function run_daemon() {
- while true
- do
- for i in {20001..20003}
- do
- local num=$(lsof -i:$i | grep "^start " | wc -l)
- if [ $num -eq 0 ];then
- nohup ./start $i > start_$i.out 2>&1 &
- fi
- done
- sleep 1
- done
- }
- nohup run_daemon > run_daemon.out 2>&1 &
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