在Bash Shell脚本中为数组分配值

Question

我有一个纯文本文件，其中包含曲目标题和艺术家，并用破折号分隔。 我想将所有标题放入一个数组（ TRK_TITLE[] ）。 同时创建一系列艺术家（ ARTIST[] ）。 以下是我正在使用的代码：

CTR=0
# Read in the track title file
while read line

do 

# Add to the counter
    CTR=$((CTR + 1))

# Get the track number
    TRK_NUM[$CTR]=$CTR

# VARIOUS is set by command line parameter
if [ $VARIOUS = "FALSE" ]
then
# -- THIS BIT WORKS! ------------------------------
TRK_TITLE[$CTR]=${line}
# ARTISTS determined by grandparent directory name.
ARTIST[$CTR]="$ARTISTS"

# THE BIT THAT DOESN'T WORK AS IT APPEARS --------- 
else
# VARIOUS has been set to TRUE
# Get the track title
# 1st, Make sure I'm dealing with something sensible
echo "$line"
# Get the length of the line,
# just for information
total_len=${#line}
# Find the position of the "-"
dash_pos=`expr index "$line" -`

# These lines prove that the syntax works
echo "${line:0:$dash_pos - 2}"

echo "${line:$dash_pos + 1}"

echo $total_len "--" $dash_pos 
# Now add to arrays
TRK_TITLE[$CTR]="${line:0:$dash_pos -2}"
#TRK_TITLE="${line:0:$dash_pos -2}"

ARTIST[$CTR]="${line:$dash_pos + 1}"
#ARTIST="${line:$dash_pos + 1}"

#Now to see the output
echo $TRK_TITLE[$CTR] "is Track"
#echo "$TRK_TITLE is Track"

echo $ARTIST[$CTR] "is Artist"
#echo "$ARTIST is Artist"

fi

# keep going until the end
# Variable name used for input file
done < "$FYL_2_USE"

因此，当散列位于它们所在的位置时，输出为：

献给我爱的人-妈妈和爸爸

献给我所爱的人

妈妈和爸爸

53-29

[19]是追踪

[19]是艺术家

如果在变量和echo语句上交换了哈希，则输出为：

献给我爱的人-妈妈和爸爸

献给我所爱的人

妈妈和爸爸

53-29

献给我所爱的人

妈妈和爸爸是艺术家

Shell是Gnu Bash V4.1.0（2）

Answer 1

如果您更换：

echo $TRK_TITLE[$CTR] "is Track"
echo $ARTIST[$CTR] "is Artist"

有：

echo ${TRK_TITLE[$CTR]} "is Track"
echo ${ARTIST[$CTR]} "is Artist"

您的脚本可以正常工作。