Question

我有如下所示的脚本。 Q可以是1、3或6。 1 = E，3 = R，6 =S。因此，当我发送到串行端口时，Q应该是E，R或S。我完全被困住了。有帮助吗？

touch $logfile

echo "file = $file"

# Split the fields into the Ademco/SIA ContactID fields
MT=`echo $EVENT | cut -b5-6`
ACCT=`echo $EVENT | cut -b1-4`
#MT=`echo $EVENT | cut -b5-6`
Q=`echo $EVENT | cut -b7`
XYZ=`echo $EVENT | cut -b8-10`
GG=`echo $EVENT | cut -b11-12`
CCC=`echo $EVENT | cut -b13-15`
S=`echo $EVENT | cut -b16`

###############################################################################
# Start Logging
################################################################################

echo "================================================================================" >> $logfile
echo "            Alarm Notification received at `date`"  >> $logfile
echo "============================================================================    ====" >> $logfile
echo Alarm String was $EVENT >> $logfile
echo Account Number $ACCT >> $logfile
echo Message Type $MT >> $logfile
echo Event Qualifier $Q >> $logfile
echo Event Code $XYZ >> $logfile
echo Group $GG >> $logfile
echo Zone $CCC >> $logfile
echo Checksum $S >> $logfile
echo "" >> $logfile
echo 5012 $MT$ACCT$Q$XYZ$GG$CCC'\024\r' >> /dev/ttyAMA0
echo 5012 $MT$ACCT$Q$XYZ$GG$CCC >> /home/monitoring/pinCaptur/signals.txt

Answer 1

您可以使用tr：

Q="123456"
newQ=$(tr "136" "ERS" <<< "${Q}")
echo ${newQ}

E2R45S

Answer 2

您可以使用if else语句或数组将数字1、3、6映射到字母E，R，S。示例：

map=([1]=E [3]=R [6]=S)
Q=1
echo "${map[Q]}"     # prints E
Q=3
echo "${map[Q]}"     # prints R
Q=6
echo "${map[Q]}"     # prints S

还可以考虑使用shellcheck.net来改善脚本。

Answer 3

在这里需要一个switch语句，如果输入值错误，它将允许您退出。

case $Q in
  1)
    Q=E
    ;;
  3)
    Q=R
    ;;
  6)
    Q=S
    ;;
  *)
    echo "We have an issue here"
    exit 1
esac

需要在此脚本中更改变量

3 个答案: