有在我的bash腳本數組循環的問題首先

Question

第一件事，這裏是代碼：

# build.prop Tweaks 
FILE=/system/build.prop 
#Properties to change Array 
PROPARR=('net.tcp.buffersize.default' 'net.tcp.buffersize.wifi' 'net.tcp.buffersize.umts' 'net.tcp.buffersize.gprs' 'net.tcp.buffersize.edge' 'wifi.supplicant_scan_interval' 'ro.HOME_APP_ADJ' 'dalvik.vm.dexopt-flags' 'dalvik.vm.execution-mode' 'dalvik.vm.heapstartsize' 'dalvik.vm.heapgrowthlimit' 'dalvik.vm.heapsize' 'dalvik.vm.heaptargetutilization' 'dalvik.vm.heapminfree' 'dalvik.vm.heapmaxfree' 'debug.sf.hw'); 
#Property Values 
PROPVALARR=('4096,87380,256960,4096,16384,256960' '4096,87380,256960,4096,16384,256960' '4096,87380,256960,4096,16384,256960' '4096,87380,256960,4096,16384,256960' '4096,87380,256960,4096,16384,256960' '300' '1' 'm=y,v=n,o=v,u=n' 'init:jit' '16m' '128m' '512m' '0.75' '12m' '16m' '1'); 
# this variable is just a place holder for the future line number of the prop values 
lineNum= 
# Loop through the properties I want to change 
for i in $PROPARR; do 

prop=$PROPARR($i); 
arg=$PROPVALARR($i); 
if grep -Fq $prop $FILE ; then 
     lineNum=`sed -n "/${prop}/=" $FILE`; 
     sed -i "${lineNum} c${prop}=${arg}" $FILE; 
else 
     echo $prop=$arg >> $FILE; 
fi; 

done; 

現在，orignally的循環，我訪問這樣的數組：prop=$PROPARR[$i]; arg=$PROPVALARR[$i];

但它被寫奇怪的代碼的build.prop末，它是唯一的數組（S）

所以，後來我想它就像我張貼在第一個項目，現在我得到一個syntax error near unexpected token '('

因此，在我遇到的第一個問題中，我認爲假設＃1循環未被正確寫入是安全的，＃2我正嘗試寫入的文本寫入錯誤，＃3是正確的方式訪問項目

所以，問題是，我怎麼能解決這個問題，因此該循環正確遍歷數組，並寫入適當的行build.prop（或更新，如果發現線路）

Answer 1

有一些問題你如何引用數組值。下面的代碼應該可以工作。

# build.prop Tweaks 
FILE=/System/build.prop 
#Properties to change Array 
PROPARR=('net.tcp.buffersize.default' 'net.tcp.buffersize.wifi' 'net.tcp.buffersize.umts' 'net.tcp.buffersize.gprs' 'net.tcp.buffersize.edge' 'wifi.supplicant_scan_interval' 'ro.HOME_APP_ADJ' 'dalvik.vm.dexopt-flags' 'dalvik.vm.execution-mode' 'dalvik.vm.heapstartsize' 'dalvik.vm.heapgrowthlimit' 'dalvik.vm.heapsize' 'dalvik.vm.heaptargetutilization' 'dalvik.vm.heapminfree' 'dalvik.vm.heapmaxfree' 'debug.sf.hw'); 
#Property Values 
PROPVALARR=('4096,87380,256960,4096,16384,256960' '4096,87380,256960,4096,16384,256960' '4096,87380,256960,4096,16384,256960' '4096,87380,256960,4096,16384,256960' '4096,87380,256960,4096,16384,256960' '300' '1' 'm=y,v=n,o=v,u=n' 'init:jit' '16m' '128m' '512m' '0.75' '12m' '16m' '1'); 
# this variable is just a place holder for the future line number of the prop values 
lineNum= 
# Loop through the properties I want to change 
for i in ${!PROPARR[@]}; do 
    prop=${PROPARR[$i]}; 
    arg=${PROPVALARR[$i]}; 
    if grep -Fq $prop $FILE ; then 
     lineNum=`sed -n "/${prop}/=" $FILE`; 
     sed -i "${lineNum} c${prop}=${arg}" $FILE; 
    else 
     echo $prop=$arg >> $FILE; 
    fi; 
done; 

編輯：好的，您還需要對您的sed語句進行一些更改。還要編寫/ System /你需要root權限。以下是更新後的代碼：

# build.prop Tweaks 
FILE=/System/build.prop 
#Properties to change Array 
PROPARR=('net.tcp.buffersize.default' 'net.tcp.buffersize.wifi' 'net.tcp.buffersize.umts' 'net.tcp.buffersize.gprs' 'net.tcp.buffersize.edge' 'wifi.supplicant_scan_interval' 'ro.HOME_APP_ADJ' 'dalvik.vm.dexopt-flags' 'dalvik.vm.execution-mode' 'dalvik.vm.heapstartsize' 'dalvik.vm.heapgrowthlimit' 'dalvik.vm.heapsize' 'dalvik.vm.heaptargetutilization' 'dalvik.vm.heapminfree' 'dalvik.vm.heapmaxfree' 'debug.sf.hw'); 
#Property Values 
PROPVALARR=('4096,87380,256960,4096,16384,256960' '4096,87380,256960,4096,16384,256960' '4096,87380,256960,4096,16384,256960' '4096,87380,256960,4096,16384,256960' '4096,87380,256960,4096,16384,256960' '300' '1' 'm=y,v=n,o=v,u=n' 'init:jit' '16m' '128m' '512m' '0.75' '12m' '16m' '1'); 
# this variable is just a place holder for the future line number of the prop values 
# Loop through the properties I want to change 
for i in ${!PROPARR[@]}; do 
    prop=${PROPARR[$i]}; 
    arg=${PROPVALARR[$i]}; 
    if grep -Fq $prop $FILE ; then 
     sed -i.bak s/$prop.*/$prop=$arg/ $FILE; 
    else 
     echo $prop=$arg >> $FILE; 
    fi; 
    echo "$prop $arg" 
done; 

還值得一提的是，-i選項sed的聲明將與循環的每次迭代被覆蓋。因此，在運行此腳本後，您將無法備份原始文件。也許在運行腳本之前手動進行備份或將其作爲其一部分添加進去。

Answer 2

利用關聯數組（Bash中內置的功能）的更好的解決方案，更乾淨，更易讀。

declare -A PROPERTIES 
PROPERTIES['net.tcp.buffersize.default']="4096,87380,256960,4096,16384,256960" 
PROPERTIES['net.tcp.buffersize.wifi']="4096,87380,256960,4096,16384,256960" 
PROPERTIES['net.tcp.buffersize.umts']="4096,87380,256960,4096,16384,256960" 
PROPERTIES['net.tcp.buffersize.gprs']="4096,87380,256960,4096,16384,256960" 
PROPERTIES['net.tcp.buffersize.edge']="4096,87380,256960,4096,16384,256960" 
PROPERTIES['wifi.supplicant_scan_interval']=300 
PROPERTIES['ro.HOME_APP_ADJ']=1 
PROPERTIES['dalvik.vm.dexopt-flags']=m=y,v=n,o=v,u=n 
PROPERTIES['dalvik.vm.execution-mode']=init:jit 
PROPERTIES['dalvik.vm.heapstartsize']=16m 
PROPERTIES['dalvik.vm.heapgrowthlimit']=128m 
PROPERTIES['dalvik.vm.heapsize']=512m 
PROPERTIES['dalvik.vm.heaptargetutilization']=0.75 
PROPERTIES['dalvik.vm.heapminfree']=12m 
PROPERTIES['dalvik.vm.heapmaxfree']=16m 
PROPERTIES['debug.sf.hw']=1 

# Loop through the properties I want to change 
for prop in ${!PROPERTIES[@]}; do 

    arg=${PROPERTIES["$prop"]} 
    echo $prop = $arg 

done; 

在這個片段中，我只關注如何遍歷關聯數組。 你應該能夠將自己的邏輯掛鉤到循環中。

對於一個完整的參考：

http://www.gnu.org/software/bash/manual/bashref.html#Arrays