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: WebJan 18, 2024 · Syntax to find out if file exists with conditional expressions in a Bash Shell The general syntax is as follows: [ parameter FILE ] OR test parameter FILE OR [ [ parameter FILE ]] Where parameter can be any one of the following: -e: Returns true value if file exists. -f: Return true value if file exists and regular file.
How to detect in Bash when Curl fails downloading non-existent file?
WebNov 27, 2015 · Here is some bash code that checks if the files exists on the webserver and if it does have the same size as the one one disk. The file is not downloaded, only checked using a HEAD request. TMPFILE=$ (tempfile) FILE=location/some_file_to_upload.txt … 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 can parakeets and finches live in same cage
PHP: file_exists - Manual
WebJul 17, 2024 · 1 Answer Sorted by: 11 We should escape the $ and " in the STRING variable. Otherwise, it will expand the $PATH Declare it as: STRING="export PATH=\"\$PATH:/opt/mssql-tools/bin\"" As commented by @muru, try as if grep -q "$STRING" "$FILE" ; then echo 'the string exists' ; else echo 'the string does not exist' ; fi WebJan 17, 2024 · From: Sztrepka Pál via curl-users Date: Sun, 17 Jan 2024 10:20:00 +0100 I want to write a function that checks to see if a remote file (prot. http) exists. ( Do not download the file content, only check! ) I have tried several curl options but so far have failed. WebCURLE_FTP_COULDNT_RETR_FILE The only time that error is produced is if CURL could "RETR"ieve the file, meaning the file doesnt exist if that error is produced. Otherwise, different errors are produced (like, couldn't write retrieved data to application). flamborough head bird observatory