统计系统进程数的脚本

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代码:

#!/bin/bash

cd /proc
process_amount=0
for filename in *; do
    if echo $filename|grep "[0-9]." >/dev/null; then
        let process_amount++
    fi
done

echo $(( process_amount-1 ))

引用:

-(dearvoid@LinuxEden:Forum)-(~/tmp)-
[$$=16263 $?=0] ; cat pids.sh
#!/bin/bash

cd /proc
set -- [0-9]*
echo $#
-(dearvoid@LinuxEden:Forum)-(~/tmp)-
[$$=16263 $?=0] ; ./pids.sh
85
-(dearvoid@LinuxEden:Forum)-(~/tmp)-
[$$=16263 $?=0] ; ps -ef | wc -l
86
-(dearvoid@LinuxEden:Forum)-(~/tmp)-
[$$=16263 $?=0] ; bye

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代码:

> > ps -ef | wc -l
112

> time ./j.sh
111

real    0m0.007s
user    0m0.008s
sys     0m0.000s
>  time ./k.sh
100

real    0m0.292s
user    0m0.052s
sys     0m0.168s
> cat j.sh
#! /bin/bash

cnt=
for i in $( ls -d /proc/[1-9]* ); do
    (( j++ ))
done

echo $j

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代码:

#!/bin/bash

eval array=($(ls -d /proc/[1-9]*))

echo ${#array[@]}