File Search commands in Linux

Locate

• Usage: Locate file name
• Search by file name in background database, search faster, database is/var/lib/mlocate
• UpdateDB: Updating the database
• Search by file name only

Whereis command to search for commands

• Whereis command name #搜索命令所在路径及帮助文档所在位置
• Options
  • -B Find only executable files
  • -M only find help files
• Only foreign commands can be searched

Which command to search for commands

• #搜索命令所在路径及Aliases
• Only foreign commands can be searched

Find

• Find [Search Range] [search criteria] #搜索文件
  • The Find/-name Install.log #避免大范围搜索, which consumes system resources #find是在系统当中搜索符合条件的文件名. If a match is required, wildcard matches are used, and wildcards are exactly matches *: matches any content? Matches any one of the characters [] matches any one of the characters in parentheses
  • Find/root-iname Install.log #不区分大小写
  • Find/root-user Root #按照所有者搜索
  • Find/root-nouser #查找没有所有者的文件
  • find/var/log/-mtime +10 #查找10天前修改的文件
    • -10 #10天内修改的文件
    • Ten #10天当天修改的文件
    • +10 #10天前修改的文件
    • Atime #文件访问时间
    • CTime #改变文件属性
    • Mtime #修改文件内容
  Find. -size 25k #查找文件大小是25kb的文件 kb is small K, mega is capital M
  • -25k #小于25kb的文件
  • 25k #等于25kb的文件
  • +25k #大于25kb的文件
  • Find. -inum 262422 #查找i节点是262422的文件
  • Find/etc-size +20k-a-size-50k-exec ls-lh {} \;
    • Find files that are larger than 20kb and less than 50kb in the/etc/directory, and display more information
    • #-exec/-ok command {}\; Perform action on search results

Grep

• grep [Options] string file name #在文件当中匹配符合条件的字符串
  • -I ignores case
  • -V excludes the specified string

The difference between the Find command and the grep command

1. fing command: Search the system for eligible file names, if necessary match, wildcard match, wildcard is exactly match
2. grep command: Searches the file for qualifying strings, matches with regular expressions if required, regular expressions contain matches

File Search commands in Linux