If you use the compress option as shown below, the rotated files will be compressed with gzip utility. This is a tool that facilitates the rotation of log files and archival & removal of old ones to free up disk space. File must exist." Syslogd will create /etc/syslog.pid file during its start-up, which contains the process id of sylogd. Gzip is faster, but it generally compresses a bit less, so you get a somewhat larger file. Use the uncompress command to restore compressed files to their original form. Syslog is the (built-in) solution for logging messages generated by AIX. Example "mail messages, at debug or higher, go to Log file. Older log files are usually compressed and appear as apport.log.2.gz, apport.log.3.gz, apport.log.4.gz, and so on. Compressing files Syntax: Description: Example(s) gzip {filename} Gzip compress the size of the given files using Lempel-Ziv coding (LZ77). File is restored to their original form using this command. Logrotate compress option: Compress the rotated log files. To compress files you can use gzip, bzip2 and zip commands. To do so, just replace the -z for gzip in the commands here with a -j for bzip2. Bzip2 is slower, but it compresses a bit more, so you get a somewhat smaller file. This allows you to create bzip2-compressed files, often named .tar.bz2, .tar.bz, or .tbz files. Whenever possible, each file is replaced by one with the extension .gz. The AIX kernel, various daemons and applications are able to send their log output to syslogd (syslog daemon). Typically, source code or English text is reduced by 50 to 60 percent. This helps the respective service that belongs to that log file can write to the proper file. The compress option means that rotated log files that are not in use will be compressed. The log rotation process is facilitated using a utility called logrotate. To expand compressed file (decompresses) you can use and gzip -d, bunzip2 (bzip2 -d), unzip commands. 4. While manipulating log files, you might find the sed substitute, sed delete tips helpful. The default is not to rotate log files. The archive option will save rotated log files that are not in use to archive. How do I compress a directory and its contents in ksh on AIX for a file I do compress filename Stack Exchange Network Stack Exchange network consists of 176 Q&A communities including Stack Overflow , the largest, most trusted online community for developers to … The amount of compression depends on the size of the input, the number of bits per code specified by the Bits variable, and the distribution of common substrings. For example, the files belonging to a user who is away for extended leave can be compressed and placed into a tar archive on disk or to a tape and later be restored. bzip2 -d mydata.doc.bz2 gunzip mydata.doc.bz2: unzip {.zip file} Extract compressed files in a ZIP archive. Compress log files created by shell scripts that run at night; it is easy to have the script compress the file before it exits. Compress files that are not currently being accessed.

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