备份bash脚本错误：意外标记`新行'附近的语法错误

Question

我在处理备份的bash脚本上发现错误：每日，每月，每年。下面是该脚本：

#!/bin/bash 

echo > /home/alpha/folder/keep.txt 
#writing dates of the backups that should be kept to the array 

for i in {0..7}; do ((keep[$(date +%Y%m%d -d "-$i day")]++)); done 
for i in {0..4}; do ((keep[$(date +%Y%m%d -d "sunday-$((i+1)) week")]++)); done 
for i in {0..12}; do 
     DW=$(($(date +%-W)-$(date -d $(date -d "$(date +%Y-%m-15) -$i month" +%Y-%m-01) +%-W))) 
     for ((AY=$(date -d "$(date +%Y-%m-15) -$i month" +%Y); AY < $(date +%Y); AY++)); do 
     ((DW+=$(date -d $AY-12-31 +%W))) 
     done 
     ((keep[$(date +%Y%m%d -d "sunday-$DW weeks")]++)) 
done 
for i in {0..30}; do 
     DW=$(date +%-W) 
     for ((AY=$(($(date +%Y)-i)); AY < $(date +%Y); AY++)); do 
     ((DW+=$(date -d $AY-12-31 +%W))) 
     done 
     ((keep[$(date +%Y%m%d -d "sunday-$DW weeks")]++)) 
     done 

#writing the array to file keep.txt line by line 
for i in ${!keep[@]}; do echo $i >> /home/alpha/folder/keep.txt; done 

#delete all files that not mentioned in keep.txt 
cd /home/alpha/folder 
ls -1 /home/alpha/folder/ | sort /home/alpha/folder/keep.txt /home/alpha/folder/keep.txt - | uniq -u | xargs rm -rf 
rm /home/alpha/folder/keep.txt 

当我尝试运行脚本，将引发错误消息：

./back.sh: line 12: syntax error near unexpected token `newline' ./back.sh: line 12: ` done' 

在哪里我做错了的脚本？

Answer 1

您的date表达式似乎在算术上下文中行为不当。添加临时变量解决您的问题对我来说：

#!/bin/bash 

echo > /home/alpha/folder/keep.txt 
#writing dates of the backups that should be kept to the array 

for i in {0..7}; do ((keep[$(date +%Y%m%d -d "-$i day")]++)); done 
for i in {0..4}; do ((keep[$(date +%Y%m%d -d "sunday-$((i+1)) week")]++)); done 
for i in {0..12}; do 
     DW=$(($(date +%-W)-$(date -d $(date -d "$(date +%Y-%m-15) -$i month" +%Y-%m-01) +%-W))) 
     begin=$(date -d "$(date +%Y-%m-15) -$i month" +%Y) 
     for ((AY=begin; AY < $(date +%Y); AY++)); do 
     ((DW+=$(date -d $AY-12-31 +%W))) 
     done 
     ((keep[$(date +%Y%m%d -d "sunday-$DW weeks")]++)) 
done 
for i in {0..30}; do 
     DW=$(date +%-W) 
     begin=$(($(date +%Y)-i)) 
     for ((AY=begin; AY < $(date +%Y); AY++)); do 
     ((DW+=$(date -d $AY-12-31 +%W))) 
     done 
     ((keep[$(date +%Y%m%d -d "sunday-$DW weeks")]++)) 
     done 

#writing the array to file keep.txt line by line 
for i in ${!keep[@]}; do echo $i >> /home/alpha/folder/keep.txt; done 

#delete all files that not mentioned in keep.txt 
cd /home/alpha/folder 
ls -1 /home/alpha/folder/ | sort /home/alpha/folder/keep.txt /home/alpha/folder/keep.txt - | uniq -u | xargs rm -rf 
rm /home/alpha/folder/keep.txt 

但是，我不确定为什么表达式在算术块内部行为不当。