在Bash Shell腳本中為數組分配值

Question

我有一個純文本文件，其中包含曲目標題和藝術家，並用破折號分隔。 我想將所有標題放入一個數組（ TRK_TITLE[] ）。 同時創建一系列藝術家（ ARTIST[] ）。 以下是我正在使用的代碼：

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，當散列位於它們所在的位置時，輸出為：

獻給我愛的人-媽媽和爸爸

獻給我所愛的人

媽媽和爸爸

53-29

[19]是追蹤

[19]是藝術家

如果在變量和echo語句上交換了哈希，則輸出為：

獻給我愛的人-媽媽和爸爸

獻給我所愛的人

媽媽和爸爸

53-29

獻給我所愛的人

媽媽和爸爸是藝術家

Shell是Gnu Bash V4.1.0（2）

Answer 1

如果您更換：

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

有：

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

您的腳本可以正常工作。