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在 Bash 中对字符串变量应用 -lt

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在 Bash 中对字符串变量应用 -lt

我是 Bash 脚本的新手。我必须在这里比较两个值，$i 和 $cdsStart：检查 $i 是否小于 $cdsScript，下面是我执行相同操作的代码。

inputFile="$1"
while read -r transcriptName chromosomeNum strand transcriptStart transcriptEnd cdsStart cdsEnd numExons exSt exEnd rest ;
do
  if [ "$transcriptName" == "ENST00000359033" ]
  then
     exonStart=$(echo "$exSt" | egrep -o '[0-9]+')
     exonEnd=$(echo "$exEnd" | egrep -o '[0-9]+')
     echo "exon-start: $exonStart"
     echo "exon-end: $exonEnd"

     for i in "$exonStart"
     do
      if (( "$i" -lt "$cdsStart" ))  ##this does not work
      then
        echo "value: $i"    
      fi    
    done
  fi
done < "$inputFile"

它只是报告“表达式中的语法错误”，有人能告诉我如何调试它吗？

谢谢

答案1

有人能告诉我如何调试这个吗？

使用ShellCheck – shell脚本分析工具：

$ shellcheck myscript

Line 1:
inputFile="$1"
^-- SC2148: Tips depend on target shell and yours is unknown. Add a shebang or a 'shell' directive.

Line 2:
while read -r transcriptName chromosomeNum strand transcriptStart transcriptEnd cdsStart cdsEnd numExons exSt exEnd rest ;
                             ^-- SC2034: chromosomeNum appears unused. Verify use (or export if used externally).
                                           ^-- SC2034: strand appears unused. Verify use (or export if used externally).
                                                  ^-- SC2034: transcriptStart appears unused. Verify use (or export if used externally).
>>                                                                ^-- SC2034: transcriptEnd appears unused. Verify use (or export if used externally).
>>                                                                                       ^-- SC2034: cdsEnd appears unused. Verify use (or export if used externally).
>>                                                                                              ^-- SC2034: numExons appears unused. Verify use (or export if used externally).

Line 6:
     exonStart=$(echo "$exSt" | egrep -o '[0-9]+')
                                ^-- SC2196: egrep is non-standard and deprecated. Use grep -E instead.

Line 7:
     exonEnd=$(echo "$exEnd" | egrep -o '[0-9]+')
                               ^-- SC2196: egrep is non-standard and deprecated. Use grep -E instead.

Line 11:
     for i in "$exonStart"
              ^-- SC2066: Since you double quoted this, it will not word split, and the loop will only run once.

Line 13:
      if (( "$i" -lt "$cdsStart" ))  ##this does not work
         ^-- SC1105: Shells disambiguate (( differently or not at all. For subshell, add spaces around ( . For ((, fix parsing errors.
          ^-- SC2205: (..) is a subshell. Did you mean [ .. ], a test expression?
                 ^-- SC1106: In arithmetic contexts, use < instead of -lt

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