Super Speedy Syslog Searcher! (s4)

Speedily search and sort many syslog files by datetime.

Super Speedy Syslog Searcher (s4) is a command-line tool to search and sort syslog files within compressed files (.gz, .xz) and archives (.tar, .zip). The first goal of s4 is speedy searching and printing.

• Use
  • Install super_speedy_syslog_searcher
  • Run s4
  • --help
• About
  • Features
  • Limitations
  • Hacks
• Further Reading

Use

Install super_speedy_syslog_searcher

lang-text cargo install super_speedy_syslog_searcher

Run s4

For example, print all the syslog lines in syslog files under /var/log/

lang-text s4 /var/log

Print only the syslog lines since yesterday

lang-text s4 /var/log -a $(date -d "yesterday" '+%Y-%m-%d')

Print only the syslog lines that occurred two days ago

lang-text s4 /var/log -a $(date -d "2 days ago" '+%Y-%m-%d') -b $(date -d "1 days ago" '+%Y-%m-%d')

Print only the syslog lines that occurred two days ago during the noon hour

lang-text s4 /var/log -a $(date -d "2 days ago 12:00" '+%Y-%m-%dT%H:%M:%S') -b $(date -d "2 days ago 13:00" '+%Y-%m-%dT%H:%M:%S')

Print only the syslog lines that occurred two days ago during the noon hour in Bengaluru, India (timezone offset +05:30) and prepended with equivalent UTC datetime.

lang-text s4 /var/log -u -a "$(date -d "2 days ago 12:00" '+%Y-%m-%dT%H:%M:%S') +05:30" -b "$(date -d "2 days ago 13:00" '+%Y-%m-%dT%H:%M:%S') +05:30"

--help

```lang-text Super Speedy Syslog Searcher will search syslog files and sort entries by datetime. DateTime filters may be passed to narrow the search. It aims to be very fast.

USAGE: s4 [OPTIONS] ...

ARGS: ... Path(s) of syslog files or directories. Directories will be recursed, remaining on the same filesystem. Symlinks will be followed

OPTIONS: -a, --dt-after DateTime After filter - print syslog lines with a datetime that is at or after this datetime. For example, '20200102T123000' -b, --dt-before DateTime Before filter - print syslog lines with a datetime that is at or before this datetime. For example, '20200102T123001' -t, --tz-offset DateTime Timezone offset - for syslines with a datetime that does not include a timezone, this will be used. For example, '-0800' '+02:00' (with or without ':'). If passing a value with leading '-', use the '=' to explicitly set the argument, e.g. '-t=-0800'. Otherwise the CLI argument parsing will fail. Default is local system timezone offset. [default: -08:00] -u, --prepend-utc Prepend DateTime in the UTC Timezone for every line -l, --prepend-local Prepend DateTime in the Local Timezone for every line -n, --prepend-filename Prepend file basename to every line -p, --prepend-filepath Prepend file full path to every line -w, --prepend-file-align Align column widths of prepended data -c, --color Choose to print to terminal using colors [default: auto] [possible values: always, auto, never] -z, --blocksz Read blocks of this size. May pass decimal or hexadecimal numbers. Using the default value is recommended [default: 65535] -s, --summary Print a summary of files processed. Printed to stderr -h, --help Print help information -V, --version Print version information

DateTime Filter patterns may be: "%Y%m%dT%H%M%S" "%Y%m%dT%H%M%S%z" "%Y-%m-%d %H:%M:%S" "%Y-%m-%d %H:%M:%S %z" "%Y-%m-%dT%H:%M:%S" "%Y-%m-%dT%H:%M:%S %z" "%Y/%m/%d %H:%M:%S" "%Y/%m/%d %H:%M:%S %z" "%Y%m%d" "%Y%m%d %z" "+%s"

Without a timezone offset (%z or %Z), the Datetime Filter is presumed to be the system timezone. Pattern "+%s" is Unix epoch timestamp in seconds with a preceding "+". Ambiguous timezones will be rejected, e.g. "SST". Prepended datetime, -u or -l, is printed in format "%Y%m%dT%H%M%S%.6f %z:". DateTime formatting is described at https://docs.rs/chrono/latest/chrono/format/strftime/

DateTimes supported are only of the Gregorian calendar. DateTimes supported language is English. ```

About

Features

• Prepends datetime and file paths, for easy programmatic parsing or visual traversal of varying syslog messages
• Supports many varying datetime formats including (WHAT ARE THOSE OFFICIAL ONES?)
• Tested against "in the wild" log files from varying Linux distributions (see ./logs/)
• Comparable speed as GNU grep and sort (see ./tools/compare-grep-sort.sh)
• Handles invalid UTF-8 (prints whatever is found)

Limitations

• Only handles UTF-8 or ASCII encoded log files.
• Cannot handle multi-file .gz files (multiple "streams") (TODO describe problem)
• Cannot handle multi-file .xz files (chooses first file found) (TODO describe problem)
• Cannot process archive or compressed files within other archive or compressed files. e.g. a .tar file within another .tar file will not be processed, a .gz file within a .tar file will not be processed.

Hacks

• Entire .xz files are read into memory during the initial open (see 607a23c00aff0d9b34fb3d678bdfd5c14290582d)

Further Reading

• Extended-Thoughts.md
• CHANGELOG.md