linux - Is there a Bash equivalent to PowerShell's CmdLets, which act as a pipeline filter? -

i have program writing text outputs stdout. filter , color these outputs. in powershell, wrote cmdlet, parses text lines , emits them console , colors parts if needed. example

in powershell have such function:

function write-coloredprogline { [cmdletbinding()]   param(     [parameter(valuefrompipeline=$true)]     $inputobject,      [parameter(position=1)]     [switch]$suppresswarnings = $false,     [parameter(position=2)]     [string]$indent = ""   )    begin   { $errorrecordfound = $false  }    process   { if (-not $inputobject)     { write-host "empty pipeline!"  }     elseif ($inputobject -is [string])     { if ($inputobject.startswith("vlib "))       { write-host "${indent}$inputobject" -foregroundcolor gray   }  }       elseif ($inputobject.startswith("** warning:") -and -not $suppresswarnings)       { write-host "${indent}warning: " -nonewline -foregroundcolor yellow         write-host $inputobject.substring(12)       }       elseif ($inputobject.startswith("** error:") -and -not $suppresswarnings)       { $errorrecordfound += 1         write-host "${indent}warning: " -nonewline -foregroundcolor yellow         write-host $inputobject.substring(12)       }     }     else     { write-host "unsupported object in pipeline stream"   }   }    end   { $errorrecordfound   } } 

usage:

$expr = "prog.exe -flag -param foo" $errors = invoke-expression $expr | write-coloredprogline $false "  " 

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how can process such operations in bash?

i need kind of inner state in filter script, tools grc not powerful enough.

here posix compatible way that:

awk ' /vlib/ {   $0 = "\33[1;36m" $0 "\33[m" } /warning/ {   $0 = "\33[1;33m" $0 "\33[m" } 1 ' 

result:

it should noted cannot use posix sed this. while tempting, posix sed has no way create escape sequences needed here, while posix awk does.