#Unix command to list zero byte file and delete files

[mmorgsac]

Unix command to list zero byte file and delete files

#UNIX COMMAND TO LIST ZERO BYTE FILE AND DELETE FILES HOW TO#

#UNIX COMMAND TO LIST ZERO BYTE FILE AND DELETE FILES MANUAL#

#UNIX COMMAND TO LIST ZERO BYTE FILE AND DELETE FILES WINDOWS#

It would be easy to find EmptyFolder1, and EmptyFolder2. Sent it off to Steve to try, and when he emailed me back I realized how tough of a problem this is.įor example, if you were looking to remove empty directories from this structure: In my arrogance I thought this would be such an easy task, and coded a utility in less than an hour.

#UNIX COMMAND TO LIST ZERO BYTE FILE AND DELETE FILES WINDOWS#

I am old-school, having started as a UNIX system programmer some … 40 years ago:-) So, I like elegant solutions, and in UNIX, this would be a simple one-line piped solution … unfortunately, I’ve been stuck on Windows for the past few decades…I’m wondering if you’ve ever tackled this, and, if so, if there’s anything you can share?” I have found all sorts of approaches to this, but none are elegant. “…I want to round out this junk cleaning by trashing empty directories as well. If you like this post probably you might like my next ones, so please support me by subscribing my blog.A few months ago I received an email from Steve in Ontario:

#UNIX COMMAND TO LIST ZERO BYTE FILE AND DELETE FILES HOW TO#

How To Install VerneMQ on UbunTu, RHEL, Docker, Debian and Cent OS.to count the words, lines and characters of file # wc install.log to find the location of file or directory # find / -iname to view the bottom lines of a file # tail # tail -3 to view the top lines of a file # head # head -5 to view the contents of a file screen-wise # less to see the calendar # cal | less or # cal | more r Recursive (Directory along with contents) to remove or delete a file or directory # rm to remove or delete an empty directory # rmdir to move a file or directory to a different location # mv r Recursive (to copy the directory along with its contents) to view the commands history # history

#UNIX COMMAND TO LIST ZERO BYTE FILE AND DELETE FILES MANUAL#

to view the manual page of a command # man to change to the users home directory # cd to change directory two levels back # cd. to change directory one level back # cd. to create multiple directories # mkdir to create file using by Vi editor # vi to change the time stamp of a file or directory # touch to create multiple zero byte files # touch To combine the data of two or more files into a third file # cat > to append or add to an existing file # cat > Users can create files in linux by using these commands: a All files and directories including hidden It is the default mount point for removable storage media such as cdrom/dvd and pendrives etc. It generally contains the third party software. It contains information about all hardware devices. It contains variable information, such as lags and print queues. It contains the programs and applications which are available for users (smililar to program files in Windows) /var It contains essential commands which are used by all users. It contains essential system commands which can only be used by the superuser (root). it also contains the files related for booting the OS such as the boot loader. It contains the kernel, which is the core of the operating system. When any user logs in the current working directory by default is the user’s home directory. It contains the home directory of all users (similar to ‘documents and settings’ folder in Windows). In Linux Unix the administrator is called as Root. All other directories are placed under it. It is at the top of the file system structure. This directory is called as the ‘root’ directory.

[javatutorialcorner]

tar Linux Command

tar

tar [options] [tarfile] [other-files]

Description

Copy files to or restore files from an archive medium. If any files are directories, tar acts on the entire subtree. Options need not be preceded by - (though they may be). The exception to this rule is when you are using a long-style option (such as --modification-time). In that case, the exact syntax is: tar--long-option -function-options files For example: tar --modification-time -xvf tarfile.tar Function options You must use exactly one of these, and it must come before any other options: -c, --create Create a new archive. -d, --diff, --compare Compare the files stored in tarfile with other-files. Report any differences: missing files, different sizes, different file attributes (such as permissions or modification time). --delete Delete from the archive. This option cannot be used with magnetic tape. -r, --append Append other-files to the end of an existing archive. -t, --list Print the names of other-files if they are stored on the archive (if other-files are not specified, print names of all files). -u, --update Add files if not in the archive or if modified. -x, --extract, --get Extract other-files from an archive (if other-files are not specified, extract all files). -A, --catenate, --concatenate Concatenate a second tar file to the end of the first.

Options

[drive] [density] Set drive (0-7) and storage density (l, m, or h, corresponding to low, medium, or high). Not available in all versions of tar. --anchored Exclude patterns must match the start of the filename (the default). --atime-preserve Preserve original access time on extracted files. -b n, --blocking-factor=n Set block size to n × 512 bytes. --backup[=type] Back up files rather than deleting them. If no backup type is specified, a simple backup is made with ~ as the suffix. (See also --suffix.) The possible values of type are: t, numbered Make numbered backups. nil, existing Make numbered backups if there are already numbered backups; otherwise make simple backups. never, simple Always make simple backups. --checkpoint List directory names encountered. --exclude=pattern Remove files matching pattern from any list of files. -f file, --file=file Store files in or extract files from archive file. Note that file may take the form hostname:filename. --force-local Interpret filenames in the form hostname:filename as local files. -g file, --listed-incremental=file Create new-style incremental backup. --group=group Use group as the group for files added to the archive. -h, --dereference Dereference symbolic links, and archive the files they point to rather than the symbolic link. --help Print help message and exit. -i, --ignore-zeros Ignore zero-sized blocks (i.e., EOFs). --ignore-case Ignore case when excluding files. --ignore-failed-read Ignore unreadable files to be archived. Default behavior is to exit when encountering these. -j, --I, --bzip Compress files with bzip2 before archiving them, or uncompress them with bunzip2 before extracting them. -l, --one-file-system Do not archive files from other filesystems. -k, --keep-old-files When extracting files, do not overwrite files with similar names. Instead, print an error message. -m, --modification-time, --touch Do not restore file modification times; update them to the time of extraction. --mode=permissions Use permissions when adding files to an archive. The permissions are specified the same way as for the chmod command. --newer-mtime=date Add only files whose contents have changed since date to the archive. --no-anchor Exclude patterns may match anything following a slash. --no-ignore-case Do not ignore case when excluding files. --no-same-permissions Do not extract permissions information when extracting files from the archive. This is the default for users, and therefore affects only the superuser. --no-recursion Do not move recursively through directories. --no-same-owner When extracting, create files with yourself as owner. --no-wildcards Don't use wildcards when excluding files; treat patterns as strings. --no-wildcards-match-slash Wildcards do not match / when excluding files. --null Allow filenames to be null-terminated with -T. Override -C. --numeric-owner Use the numeric owner and group IDs rather than the names. -o, --old-archive, --portability Create old-style archive in Unix V7 rather than ANSI format. --overwrite Overwrite existing files and directory metadata when extracting from archive. --overwrite-dir Overwrite existing directory metadata when extracting from archive. --owner=owner Set owner as the owner of extracted files instead of the original owner. owner is first assumed to be a username, then, if there is no match, a numeric user ID. -p, --same-permissions, --preserve-permissions Keep permissions of extracted files the same as the originals. --posix Create a POSIX-compliant archive. --preserve Equivalent to invoking both the -p and -s options. --record-size=size Treat each record as having size bytes, where size is a multiple of 512. --recursion Move recursively through directories. --recursive-unlink Remove existing directory hierarchies before extracting directories with the same name. --remove-files Remove originals after inclusion in archive. --rsh-command=command Do not connect to remote host with rsh; instead, use command. -s, --same-order, --preserve-order When extracting, sort filenames to correspond to the order in the archive. --same-owner When extracting, create files with the same ownership as the originals. --show-omitted-dirs List directories being omitted when operating on an archive. --suffix=suffix Use suffix instead of the default ~ when creating a backup file. --totals Print byte totals. --use-compress-program=program Compress archived files with program, or uncompress extracted files with program. -v, --verbose Verbose. Print filenames as they are added or extracted. --version Print version information and exit. --volno-file=file Use/update the volume number in file. -w, --interactive, --confirmation Wait for user confirmation (y) before taking any actions. --wildcards Use wildcards when excluding files. --wildcards-match-slash Wildcards match / when excluding files. -z, --gzip, --gunzip, --ungzip Compress files with gzip before archiving them, or uncompress them with gunzip before extracting them. -B, --read-full-records Reblock while reading; used for reading from 4.2BSD pipes. -C directory, --directory=directory cd to directory before beginning tar operation. -F script, --info-script=script, --new-volume-script=script Implies -M (multiple archive files). Run script at the end of each file. -G, --incremental Create old-style incremental backup. -K file, --starting-file=file Begin tar operation at file in archive. -L length, --tape-length=length Write a maximum of length × 1024 bytes to each tape. -M, --multivolume Expect archive to be multivolume. With -c, create such an archive. -N date, --newer=date, --after-date=date Ignore files older than date. -O, --to-stdout Print extracted files to standard output. -P, --absolute-names Do not remove initial slashes (/) from input filenames. -R, --block-number Display archive's block number in messages. -S, --sparse Treat sparse files more efficiently when adding to archive. -T file, --files-from=file Consult file for files to extract or create. -U, --unlink-first Remove each existing file from the filesystem before extracting from the archive. -V name, --label=name Name this volume name. -W, --verify Check archive for corruption after creation. -X file, --exclude-from file Consult file for list of files to exclude. -Z, --compress, --uncompress Compress files with compress before archiving them, or uncompress them with uncompress before extracting them.

Examples

Create an archive of /bin and /usr/bin (c), show the command working (v), and store on the tape in /dev/rmt0: tar cvf /dev/rmt0 /bin /usr/bin List the tape's contents in a format like ls -l: tar tvf /dev/rmt0 Extract the /bin directory: tar xvf /dev/rmt0 /bin Create an archive of the current directory and store it in a file backup.tar: tar cvf - `find . -print` > backup.tar (The - tells tar to store the archive on standard output, which is then redirected.) Filter an archive through gzip, extracting the contents but leaving the original file compressed: tar xvfz chapters.tar.gz

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