Android设备CPU调频Shell脚本执行出现[xxx: not found]错误

错误原因分析 #

你遇到的[1248000: not found错误，核心是Shell语法格式问题，同时脚本还有两处细节错误：

• 条件判断语法错误：if [$bigfreq -ne $littlefreq]; then中，[是Shell内置命令，必须和后续变量之间保留空格；同理]前面也需要加空格。否则Shell会把[$bigfreq当作完整命令查找，导致找不到命令报错。
• 变量名拼写错误：cpufalf是cpuhalf的笔误，会导致cpuhalfint变量值异常。
• grep命令格式错误：grep -c ^processor/proc/cpuinfo缺少空格，正确写法是grep -c ^processor /proc/cpuinfo，否则会把路径当作匹配模式，无法正确统计CPU核心数。

修正后的脚本 #

#!/system/bin/sh
# 修正grep命令的空格问题，正确统计CPU核心数
cpucores=$(grep -c ^processor /proc/cpuinfo)
cpusint=$((cpucores-1))
littlefreq=$(cat /sys/devices/system/cpu/cpu$cpusint/cpufreq/scaling_max_freq)
bigfreq=$(cat /sys/devices/system/cpu/cpu0/cpufreq/scaling_max_freq)
cpuhalf=$((cpucores/2))
# 修正变量名拼写错误
cpuhalfint=$((cpuhalf-1))
# 修正if条件的空格问题，符合Shell语法规范
if [ $bigfreq -ne $littlefreq ]; then
        for i in $(seq 0 $cpuhalfint); do
            chmod 0644 /sys/devices/system/cpu/cpu$i/cpufreq/scaling_governor
            echo "performance" > /sys/devices/system/cpu/cpu$i/cpufreq/scaling_governor
            chmod 0644 /sys/devices/system/cpu/cpu$i/cpufreq/scaling_min_freq
            echo $bigfreq > /sys/devices/system/cpu/cpu$i/cpufreq/scaling_min_freq
        done
        # 修正循环起始值，避免重复处理同一个核心
        for x in $(seq $((cpuhalfint+1)) $cpusint); do
            chmod 0644 /sys/devices/system/cpu/cpu$x/cpufreq/scaling_governor
            echo "performance" > /sys/devices/system/cpu/cpu$x/cpufreq/scaling_governor
            chmod 0644 /sys/devices/system/cpu/cpu$x/cpufreq/scaling_min_freq
            echo $littlefreq > /sys/devices/system/cpu/cpu$x/cpufreq/scaling_min_freq
        done
else
        for i in $(seq 0 $cpusint); do
            chmod 0644 /sys/devices/system/cpu/cpu$i/cpufreq/scaling_governor
            echo "performance" > /sys/devices/system/cpu/cpu$i/cpufreq/scaling_governor
            chmod 0644 /sys/devices/system/cpu/cpu$i/cpufreq/scaling_min_freq
            echo $bigfreq > /sys/devices/system/cpu/cpu$i/cpufreq/scaling_min_freq
        done
fi

额外优化说明 #

• 把反引号`替换为$()，这是更现代、可读性更好的命令替换写法。
• 修正第二个循环的起始值，避免重复处理同一核心，优化执行逻辑。

内容的提问来源于stack exchange，提问作者IsHacker