shell test if file is compressed|How to Check Whether a File Is Compressed in Linux : warehouse Learn how to determine if a file is compressed in one of the classic formats used by compression utilities such as FileRoller, Ark, and others. Resultado da 11 de ago. de 2023 · Lista de casinos en línea que aceptan PayPal ️ Pago rápido y seguro ️ Juegos y tragamonedas online con PayPal ️ El mejor monedero electrónico en 2024 ¿Cuánto te cuesta el juego? Deténgase a .
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shell script
Learn how to determine if a file is compressed in one of the classic formats used by compression utilities such as FileRoller, Ark, and others.Why don't you use the file command to check if it is compressed instead? For example file -ib will give you the MIME type of the file which you can then use in your tests - application\x-compress; charset=binary .To get a file's size, you can use wc -c to get the size (file length) in bytes: file=file.txt. minimumsize=90000. actualsize=$(wc -c <"$file") if [ $actualsize -ge $minimumsize ]; then. echo size is over $minimumsize bytes. else. echo size is under $minimumsize bytes. fi. Hi, I need to find out whether a file is compressed or not and based on that i need to compress that file and move it to archive folder. say for e.g: If file is compressed then just move to archive folder else compress and move end if i have implemented a.
for f in * do file $f done It will display what type of files you have in the current directory and then do grep to check whether if you have compressed file Empty zip files can be detected by their content. To check for this, you can e.g. compare by hash or content equality. Counter-intuitively, you can create an empty zip file for testing only with the -i "*" option of zip. If it's not present, zip will complain and exit with error code 1 . It depends: the file command on Solaris and Linux will tell you if a file is compressed with either zip, gzip, or compress. On HPUX 10.2 the file command could not do that. Try the "file" command. Code: > file ./data//logs/91042131.log.gz.
$ file somefile1.tar.gz | grep -q 'gzip compressed data' && echo yes || echo no yes $ file somefile2.tar.gz | grep -q 'gzip compressed data' && echo yes || echo no no tarballs. The above handles gzipped tarball files, for uncompressed change out the string that grep detects:Find every zip-file in every subfolder. This will find in all subfolders of the current folder (.) the files (-type f) with the extension zip (or ZIP or Zip or zIp and so on, case is ignored, -iname) and test their integrity (option -t) being quiet (option . The fact is that I want this check to match when it finds a file.gz (gzip compressed file) and it is not . Skip to main content. Stack Exchange Network. Stack Exchange network consists of 183 Q&A communities including Stack Overflow, the largest, . (expands as you would expect in a shell command) and then runs a -f test on each, . Using command "file " in linux displays whether the file is compressed or not. How to achieve this for a file residing in HDFS file system? file 620591952596020.gz 620591952596020.gz: gzip compressed data, from FAT filesystem (MS-DOS, OS/2, NT) file 269146229598756 269146229598756: ASCII text, with very long lines
$? is a special shell variable that stores the exit status of the previous command. A value of 0 indicates success (file exists), while 1 indicates failure (file does not exist). Output: Example 2: Check if a File Exists in a Tar Gzipped Archive (Verbose Output) Command: tar tzf archive.tar.gz | grep -q 'filename' echo $? Explanation: The gzip -t command only returns an exit code to the shell saying whether the file passed the integrity test or not. Example (in a script): if gzip -t file.gz; then echo 'file is ok' else echo 'file is corrupt' fi Adding -v will make it actually report the result with a message. Example: $ gzip -v -t file.gz file.gz: OK So the file is ok. If the gzip file size is 51, it is empty. Whenever I added a char in a file and gzip the file, zipped file size begins to increase from 51. However you can guarantee it with zcat. in gzip man: The uncompressed size is given as -1 for files not in gzip format, such as compressed .Z files. To get the uncompressed size for such a file, you can use:
I have some log files that have been gzipped and then compressed using cpio. There are a number of log files that have been compressed to the one file. When I extract them the date of the file when doing an ls -la is today's date (the date I extracted them). Is there anyway to see the date. (3 Replies) check, file, shell scripts Thread Tools: Search this Thread: Top Forums Shell Programming and Scripting check to see if a file is compressed before trying to compress # 1 . I want to read a directory full of compressed files and move the file to another directory if it meets certain criteria. I only want to look at the first line of the .
If you have the Info-ZIP tools installed (zip, unzip, zipinfo) you can use zipinfo on the zip file and just send the output to /dev/null.The status will be 0 if the file is not empty. So: if zipinfo foo.zip > /dev/null; then echo not empty else echo empty fi
"For example, whether a video file is bad, or a compressed file is corrupt, etc." The unzip utility has the -t option which does the following: test archive files. This option extracts each specified file in memory and compares the CRC (cyclic redundancy check, an enhanced checksum) of the expanded file with the original file's stored CRC value
I've put a test directory in /home with size about 3TB. It is a partial copy of whole /home directory with typical mix of documents, text files, images and programs. I compressed this directory using .tar.gz which resulted in file of size # du -s ./test.tar.gz 1672083116 ./test.tar.gz. With this file existing in the file system I did this:
Section 4.3.7 of this page says that the compressed size is 4 bytes starting from byte 18. You could try reading that and comparing it to the size to the file. However, I think it's pretty much useless for checking if the zip file is corrupted for two reasons: Internally, the rm command must test for file existence anyway, so why add another test? Just issue. rm filename and it will be gone after that, whether it was there or not. Use rm -f is you don't want any messages about non-existent files. If you need to take some action if the file does NOT exist, then you must test for that yourself. Most sites will give you a check sum of some kind to check the file is good. Most of the time it is a md5sum but there are a few out there. If you can open it that is a good sign but it doesn't always mean it is good. In my shell script i'm trying to check if a specific file is exists and if it has reading permissions. My file's path has spaces in it. I quoted the file path: file='/my/path/with\ some\ \spaces/file.txt' This is the function to check if the file exists: #Check if file exists and is readable checkIfFileExists() { #Check if file exists if !
File test operators. The following operators returns true if file exists:-b FILE FILE exists and is block special -c FILE FILE exists and is character special -d FILE FILE exists and is a directory -e FILE FILE exists -f FILE FILE exists and is a regular file -g FILE FILE exists and is set-group-ID -G FILE FILE exists and is owned by the effective group ID -h FILE FILE exists .
linux
What I'd like to do is to verify that the file compressed without issues. I can create a hash value for the zip file itself, but I'm unsure as to how to do this with each individual file in the the archive or compare each uncompressed file to the compressed version of the file. Here's the compression piece of my script. However, if you need to know if something is an NTFS hard link to a file (rare, but oldest), an NTFS junction to a directory, an NTFS symlink, an NTFS volume mount point, or any type of NTFS reparse point, it gets much more complicated.[This answer does a good job describing the first three.]Let's create a simple NTFS folder to test with:
While the other answers are correct, using the "-s" option will also show the file is empty even if the file does not exist. By adding this additional check "-f" to see if the file exists first, we ensure the result is correct.. if [ -f diff.txt ] then if [ -s diff.txt ] then rm -f empty.txt touch full.txt else rm -f full.txt touch empty.txt fi else echo "File diff.txt does not exist" fi file --mime-type * -F$'\t' determines the file type of each file in the current folder (*) and prints a two-column list: the filename at hand, followed by a tab (-F'$\t'), followed by spaces for alignment, followed by the file type expressed as a MIME type.EXAMPLE 1 Test-ZipFile -Path 'MyCoolZip.zip' Demonstrates how to check the current directory if MyCoolZip.zip is really a ZIP file.I'm trying to write an extremely simple script in Ubuntu which would allow me to pass it either a filename or a directory, and be able to do something specific when it's a file, and something else when it's a directory.
I am trying to test integrity of ZIP file It looks like this command is working but I got many details about the file. I want to get a result if the test passed or failed in order to move to the next . .6.22.607.6.22.607.10.zip Type = zip Physical Size = 5738248794 64-bit = + Characteristics = Zip64 Everything is Ok Files: 902 Size . zgrep test file.gz To check difference between files use: zdiff file1.gz file2.gz . lesspipe is a shell script installed by default as part of the less package that can list the contents of a tar.gz . also has a good compressed file viewer, although I consider this a bit of cheating since mc is a file manager, albeit a text-based one . @Gilles - depends on how you read it. I actually see the question there as a typical case of XY problem: OP there wants to check if a file is a text file - and thinks piping file output to cut is the solution - sure, there's a missing space which makes it fail and that has made most people there address the Y instead of the X but Stéphane's comments and answer show the .
@Tim: (sorry I wasn't here). for (1), as I explained, the PDF is partially compressed already (most probably), that's why compressing doesn't save too much, (and decompressing makes it much bigger, becouse it decompresses all the compressed streams). (2) most probably qpdf and pdftk do more-or-less the same thing regarding compression, but qpdf can optimize too (plus many .
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shell test if file is compressed|How to Check Whether a File Is Compressed in Linux