WebJan 16, 2024 · Note: As the ” File.txt ” is present in the system. So, it printed ” File is exists “. test [expression]: Now, modify the above script in ” FirstFile.sh ” as follows #!/bin/bash … WebJan 24, 2024 · If the filename exists, the exit code will be 0 and the filename will be displayed, otherwise, the exit code will not be 0: aws s3 ls s3://bucket/filname if [ [ $? -ne 0 ]]; then echo "File does not exist" fi Share Improve this answer Follow edited Feb 20, 2024 at 13:07 Mr Chow 103 3 answered Jun 13, 2024 at 17:55 onetwopunch 261 2 4 4
How to check the existence of URL in PHP? - GeeksforGeeks
WebDec 2, 2024 · This is an example case when you can get 200 from the server and still an error (non-zero $exit_status) from curl. Even if $exit_status is 0 and $http_code is 200, you may still want to check if /tmp/downloaded.zip is a valid zip file. A basic test may be the exit status of: [ "$ (file -b --mime-type /tmp/downloaded.zip)" = application/zip ] Webusing curl for checking 10 .png files (each about 5 mb) was on average 5.7 secs. using header check for the same thing took average of 7.8 seconds! So in our test curl was … graphic for cabinate door
R: Check if URL exists
WebMay 20, 2024 · Checking if a Webpage URL exists or not is relatively easy in PHP. If the required URL does not exist, then it will return 404 error. The checking can be done with and without using cURL library. cURL: The cURL stands for ‘Client for URLs’, originally with URL spelled in uppercase to make it obvious that it deals with URLs. WebJun 9, 2024 · Is there any proper way in bash to check if lets say - zip file exists and download it. If there is no file, just wait for it and download when it is available. So e.g it checks url every x seconds, download file if available and exit, else wait for it to download. Something like: WebJul 8, 2024 · if curl --output /dev/null --silent -- head --fail "$url"; then echo "URL exists: $url" else echo "URL does not exist: $url" fi If your server refuses HEAD requests, an alternative is to request only the first byte of the file: if curl --output /dev/null --silent --fail -r 0-0 "$url"; then Solution 2 graphic for early church