将 curl 命令输出存储在批处理脚本中的变量中

Question

I tried many examples online, but was not able to make it work. I am new to this so please forgive my primitive question.

say I have this:

curl "www.google.com" -o /dev/null -s -w "%{http_code}\n"

when running this in a cmd window, it returns the response code.

200

which is as expected.

I would like to do something like this in a batch script, but also use the output of the curl command to set a variable. All examples I found online propose:

set res = $(curl "www.google.com" -o /dev/null -s -w "%{http_code}\n")
echo %res%
pause

or like this

FOR /F "tokens=* USEBACKQ" %%F IN (`curl www.google.com -o /dev/null -s -w "%{http_code}\n"`) DO ( SET var=%%F ) 
ECHO %var%
pause 

both did not work, my batch script closes immediately.

Any feedback or help is highly appreciated thank you.

Answer 1

As he has mentionned above @Compo in his comment :

"To get the result of the command as a variable at the Command Prompt, you'd use For /F "

---

@echo off
Title Store curl command output in a variable in batch script
Set "MyCommand=curl "www.google.com" -o NUL -s -w "%%{http_code}""
@for /f %%R in ('%MyCommand%') do ( Set VAR=%%R )
echo %VAR% 
pause

Answer 2

Thanks to @Compo, here is the formatted answer for other's benefit.

@echo off

For /F %%G In ('%__AppDir__%curl.exe -s -o NUL "www.google.com" -w "%%{http_code}\n"') Do Set "response=%%G"
echo response code is %response%

IF %response% == 200 (
    ECHO was able to ping google
) ELSE (
    ECHO unable to ping google
)

pause 

Answer 3

Other answers are good, but I would not use CURL to just test if we can reach a site:

@echo off
ping google.com -n 1 >nul 2>&1 
if %errorlevel% equ 1 (
  echo EHHH..NO Google is not down, we are
) else (
  echo HURRAH MAN We are OK
)

Answer 4

Based upon your own answer code, there's no need to use a for-loop to get the result saved to a variable , and then compare that variable value with a known value. You can pipe the result through findstr to see if it matches your known value instead.

Example batch-file :

@%__AppDir__%curl.exe -s -o NUL "www.google.com" -w "%%{http_code}" ^
 | %__AppDir__%findstr.exe /X "200" 1> NUL && (Echo Ping Succeeded
) || Echo Ping Failed
@Pause

It is only really one line, split for readability, so you could do it line this in cmd :

%__AppDir__%curl.exe -s -o NUL "www.google.com" -w "%{http_code}" | %__AppDir__%findstr.exe /X "200" 1> NUL && (Echo Ping Succeeded) || Echo Ping Failed

Or like this as a batch-file :

@(%__AppDir__%curl.exe -s -o NUL "www.google.com" -w "%%{http_code}" | %__AppDir__%findstr.exe /X "200" 1> NUL && (Echo Ping Succeeded) || Echo Ping Failed) & Pause