从here我得到以下命令:
awk '/em1/ {i++; rx[i]=$2; tx[i]=$10}; END{print rx[2]-rx[1] " " tx[2]-tx[1]}' \
<(cat /proc/net/dev; sleep 1; cat /proc/net/dev)
完全按预期工作。但是,我的输出是Mbps,所以我创建了2个命令,一个用于上传,一个用于下载(两个工作):
awk '/^e/ {i++; rx[i]=$2}; END{printf("%.2f Mbps", \
((rx[2]-rx[1])/1024/1024))}' <(cat /proc/net/dev; sleep 1; \
cat /proc/net/dev) # download
awk '/^e/ {i++; tx[i]=$10}; END{printf("%.2f Mbps", \
((tx[2]-tx[1])/1024/1024))}' <(cat /proc/net/dev; sleep 1; \
cat /proc/net/dev) # upload
但是当我尝试组合时,却出现了一些错误:
$ awk '/^e/ {i++; rx[i]=$2}; tx[i]=$10}; \
END{printf(" down: %.2f Mbps, up: %.2f Mbps", \
((rx[2]-rx[1])/1024/1024)), ((tx[2]-tx[1])/1024/1024))}' \
<(cat /proc/net/dev; sleep 1; cat /proc/net/dev)
awk: cmd. line:1: /^e/ {i++; rx[i]=$2}; tx[i]=$10}; END{printf(" down: %.2f Mbps, up: %.2f Mbps", ((rx[2]-rx[1])/1024/1024)), ((tx[2]-tx[1])/1024/1024))}
awk: cmd. line:1: ^ syntax error
awk: cmd. line:1: each rule must have a pattern or an action part
awk: cmd. line:1: /^e/ {i++; rx[i]=$2}; tx[i]=$10}; END{printf(" down: %.2f Mbps, up: %.2f Mbps", ((rx[2]-rx[1])/1024/1024)), ((tx[2]-tx[1])/1024/1024))}
awk: cmd. line:1: ^ syntax error
awk: cmd. line:1: /^e/ {i++; rx[i]=$2}; tx[i]=$10}; END{printf(" down: %.2f Mbps, up: %.2f Mbps", ((rx[2]-rx[1])/1024/1024)), ((tx[2]-tx[1])/1024/1024))}
awk: cmd. line:1: ^ syntax error
我尝试使用sprintf
来解决它,但结果是一样的。
操作系统:Linux 4.0.5-1-ARCH x86_64 GNU / Linux
awk
:GNU Awk 4.1.3,API:1.1(GNU MPFR 3.1.2-p11,GNU MP 6.0.0)
答案 0 :(得分:1)
错误,因为awk有助于(虽然冗长地)告诉你
awk: cmd. line:1: /^e/ {i++; rx[i]=$2}; tx[i]=$10}; END{printf(" down: %.2f Mbps, up: %.2f Mbps", ((rx[2]-rx[1])/1024/1024)), ((tx[2]-tx[1])/1024/1024))}
awk: cmd. line:1: ^ syntax error
awk: cmd. line:1: each rule must have a pattern or an action part
awk: cmd. line:1: /^e/ {i++; rx[i]=$2}; tx[i]=$10}; END{printf(" down: %.2f Mbps, up: %.2f Mbps", ((rx[2]-rx[1])/1024/1024)), ((tx[2]-tx[1])/1024/1024))}
awk: cmd. line:1: ^ syntax error
awk: cmd. line:1: /^e/ {i++; rx[i]=$2}; tx[i]=$10}; END{printf(" down: %.2f Mbps, up: %.2f Mbps", ((rx[2]-rx[1])/1024/1024)), ((tx[2]-tx[1])/1024/1024))}
awk: cmd. line:1: ^ syntax error
是关闭}
,因为您已经在rx[i]=$2};
之前和,
以及最后)
关闭了该操作阻止,因为printf
来电是printf(" down: %.2f Mbps, up: %.2f Mbps", ((rx[2]-rx[1])/1024/1024))
已经关闭。完整的函数调用是:
,
因此int j= 1;
for(int i=0; i< 5; i++)
{
while(i <3)
{
j++;
}
}
及其后面的所有内容都是语法错误,因为它本身并不是一个有效的语句。