Linux学习之路（二）

root@454009d432a4:/# apt-cache search locate　　　　　　　　　　　　//搜索locate安装包
mlocate - quickly find files on the filesystem based on their name　　　　//我们要安装的资源
dlocate - fast alternative to dpkg -L and dpkg -S
gameconqueror - locate and modify a variable in a running process (GUI)
libcommons-discovery-java - locates classes that implement a given Java interfac
e
libcommons-discovery-java-doc - locates classes that implement a given Java inte
rface (documentation)
...
...
...
root@454009d432a4:/# apt-get install mlocate　　　　　　//安装资源
...
...
...

root@454009d432a4:/# locate -h　　　　　　　　　　//命令说明
Usage: locate [OPTION]... [PATTERN]...
Search for entries in a mlocate database.

  -A, --all              only print entries that match all patterns
  -b, --basename         match only the base name of path names
  -c, --count            only print number of found entries
  -d, --database DBPATH  use DBPATH instead of default database (which is
                         /var/lib/mlocate/mlocate.db)
  -e, --existing         only print entries for currently existing files
  -L, --follow           follow trailing symbolic links when checking file
                         existence (default)
  -h, --help             print this help
  -i, --ignore-case      ignore case distinctions when matching patterns
  -p, --ignore-spaces    ignore punctuation and spaces when matching patterns
  -t, --transliterate    ignore accents using iconv transliteration when
                         matching patterns
  -l, --limit, -n LIMIT  limit output (or counting) to LIMIT entries
  -m, --mmap             ignored, for backward compatibility
  -P, --nofollow, -H     don't follow trailing symbolic links when checking file
                         existence
  -0, --null             separate entries with NUL on output
  -S, --statistics       don't search for entries, print statistics about each
                         used database
  -q, --quiet            report no error messages about reading databases
  -r, --regexp REGEXP    search for basic regexp REGEXP instead of patterns
      --regex            patterns are extended regexps
  -s, --stdio            ignored, for backward compatibility
  -V, --version          print version information
  -w, --wholename        match whole path name (default)

root@454009d432a4:/# locate cron　　　　//查找cron相关的文件
/etc/cron.d
/etc/cron.daily
/etc/cron.hourly
/etc/cron.monthly
/etc/cron.weekly
/etc/crontab
/etc/cron.d/.placeholder
/etc/cron.daily/.placeholder
/etc/cron.daily/apt-compat
/etc/cron.daily/dpkg
/etc/cron.daily/mlocate　　　　　　//安装mlocate资源时默认添加的每天定时任务
...
...
...

//正常的结果
root@454009d432a4:/# apt-cache search make | more　　　　　　//将apt-cache search make 命令的输出结果作为more命令的输入信息，因为more命令有分页输出的效果所以就形成了分页输出搜索结果的效果
cmake-extras - Extra CMake utility modules
cmake-fedora - Set of scripts and cmake modules that simplify the release proces
s
cmake-qt-gui - Qt based user interface for CMake (cmake-gui)
colormake - simple wrapper around make to colorize output
colortail - log colorizer that makes log checking easier
--More--

//错误的结果
root@454009d432a4:/# 66666 | apt-cache search　　　　//如果66666不是一个正确的命令所以apt-cache search没有输入，这时候相当于两个命令都会报错
bash: 66666: command not found　　　　　　　　　　　　//66666的错误提示
E: You must give at least one search pattern　　　　//apt-cache search的错误提示

root@454009d432a4:/# apt-cache search net-tools >> workdir/check.log　　　　//将apt-cache search net-tools的结果写入workdir/check.log文件中，如果文件不存在自动创建文件

root@454009d432a4:/# apt-cache search net-tools > workdir/check.log　　　　//将apt-cache search net-tools的结果覆盖workdir/check.log文件中的内容，如果文件不存在自动创建文件