將全局變量存儲在shell腳本中

Question

我有一個shell腳本，出現以下問題： 每次我再次執行腳本時，變量CURRENT都會重新設置爲0，但是如何才能使CURRENT在每次之後都被保存腳本執行？

#!/bin/sh 
CURRENT=0 
A='Knight rider' 
B='Full color mood blobs' 
C='Police Lights Single' 
D='Police Lights Solid' 
E='Rainbow mood' 
F='Rainbow swirl' 
G='Rainbow swirl fast' 
H='Snake' 
I='Strobe blue' 

case $CURRENT in 
    0) hyperion-remote --effect "$A"; CURRENT=$(($CURRENT + 1));; 
    1) hyperion-remote --effect "$B"; CURRENT=$(($CURRENT + 1));; 
    2) hyperion-remote --effect "$C"; CURRENT=$(($CURRENT + 1));; 
    3) hyperion-remote --effect "$D"; CURRENT=$(($CURRENT + 1));; 
    4) hyperion-remote --effect "$E"; CURRENT=$(($CURRENT + 1));; 
    5) hyperion-remote --effect "$F"; CURRENT=$(($CURRENT + 1));; 
    6) hyperion-remote --effect "$G"; CURRENT=$(($CURRENT + 1));; 
    7) hyperion-remote --effect "$H"; CURRENT=$(($CURRENT + 1));; 
    8) hyperion-remote --effect "$I"; CURRENT=0;; 
esac 

Answer 1

使用環境變量。

不要忘記在腳本末尾更新$ CURRENT。