CODEWITHSUNDEEP
batch-filefor-loop
Lawrence
Lawrence

Reputation: 43

Batch File FOR loop using variable

I extracted the last line of a text file using the following command:

for /f "tokens=*" %%m in (message_log.txt) do (
   Set lastline=%%m
)

My goal is if the variable %lastline%=="☺§☻PDF file has been aborted. then to display one output and if not exit. But I think the first three characters are messing it up. I am trying this:

for /F "tokens=1-5 delims= " %%a in (%lastline%) do (
    if %%e==aborted. (
        echo pdf not filed
    )
Pause

but the file just exits, with no pause and no output.

I can get this to work if instead of using %lastline% I refer to a file as I did in the first for loop, however I cannot get it to work with a variable.

What is the correct syntax to use a FOR loop to search inside a predefined variable?

If it is simpler my ultimate goal is to echo an error message if the last line in my text file contains the string "abort". Is there a better way to do this?

Upvotes: 1

Views: 140

Answers (1)

user6811411
user6811411

Reputation:

Your first approach is OK, just missing the check.

for /f "delims=" %%m in (message_log.txt) do Set lastline=%%m

If "%lastline%" neq "%lastline:abort=%" ^
  Echo error message the last line in message_log.txt contains the string "abort"

With findstr

for /f "delims=" %%m in (message_log.txt) do Set lastline=%%m

Echo %lastline%|Findstr /i "abort" 2>&1 >Nul && ^
  Echo error message the last line in message_log.txt contains the string "abort"

With Gnuwin32 tools installed

tail -n 1 message_log.txt|grep "abort" >NUL && ^
  Echo error message the last line in message_log.txt contains the string "abort"

Upvotes: 1

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