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tcp server in bash

我想通过nc+bash创建一个tcp server， nc负责收发数据，bash负责处理数据，如何将nc和ba …

bash 之 printf

场景：

printf "%s\n" $(</proc/$pid/cmline)

1	printf "%s\n" $(</proc/$pid/cmline)

对于多个部分的命令行会打印到多行，如 …

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bash 获取所有pid

for d in /proc/*;do [[ $d =~ /proc/[0-9]+ ]] && echo ${d#/proc/};done

1	for d in /proc/*;do [[ $d =~ /proc/[0-9]+ ]] && echo ${d#/proc/};done

ls 可以list /proc …

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count words in bash without wc

如何计算字符串中单词的数量，但是不使用wc？ eg： [crayon-67f51fb8716bf8357221 …

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cfree ( free in container)

#!/bin/bash
CGROUP_DIR=/sys/fs/cgroup/memory
UNLIMITTED=9223372036854771712

read mem_total <$CGROUP_DIR/memory.limit_in_bytes
read mem_used <$CGROUP_DIR/memory.usage_in_bytes
mem_free=$((mem_total - mem_used))

read mem_swap_total <$CGROUP_DIR/memory.memsw.limit_in_bytes
read mem_swap_used <$CGROUP_DIR/memory.memsw.usage_in_bytes
swap_total=$((mem_swap_total - mem_total))
swap_used=$((mem_swap_used - mem_used))
swap_free=$((swap_total - swap_used))

if [[ $mem_total = "9223372036854771712" ]];then
	/usr/bin/free -h && exit
fi

printf "%20s%20s%20s\n" total used free
printf "Mem:%16s%20s%20s\n"  $((mem_total/1024/1024))M $((mem_used/1024/1024))M $((mem_free/1024/1024))M
printf "Swap:%15s%20s%20s\n"  $((swap_total/1024/1024))M $((swap_used/1024/1024))M $((swap_free/1024/1024))M