linux search and compression

File search

Command search

which

which 命令

Can find known commands

which ls

Custom command

alias ui='ls --color=auto -l'

At this time, pressing ui on the command line is equivalent to ls

ui

whereis
find the absolute path of the command

whereis vim

Search for file name

find 路径 选项 描述 动作

Search by file name

find /etc -name '6789.txt'

find /etc -iname '6789.txt'

find /etc -iname hos*

Find according to file size

find /etc/ -size +5M

Find files larger than 5M under /etc/

find /etc/ -szie -5M

Find files smaller than 5M

Specify the depth of the searched directory

find / -maxdepth 3 -a -name 'idcfg-en*'

By file owner

find /home -user jack

Search by file group

find /home -group jack

Find by file type
f means normal file

find /dev/ -type f

b stands for block device file

find /dev/ -type b

l stands for linked file

find /etc -type l

Search by file permissions

find . -perm 644

find . -perm 644 -ls

ls is the action of find.

find . -perm 644 -print

find comes with print action

Press to find the post-processing action

find . -perm 714 -delete

Delete after finding out

find /etc/ -name

find /etc/ -name ifcfg* -ok cp -rvf {
    
    } /tmp \;

ok represents a kind of connector, {} represents the content found by find, which represents a kind of reference.

Depend on database to find files

locate 命令

locate ls

This command can find a lot of data

File packaging and compression

Packaging and compression

File packaging and compression commands:

tar 选项 压缩包名称 源文件

tar -f 111.tar etc

Package file

tar -cf etc.tar  etc

Pack files and compress

tar -czf etc-gzip.tar.gz etc

The compressed file is found to be smaller.
The principle of compression is the deduplication method. The advantage is that the file size is reduced, but the disadvantage is that it cannot be used directly and needs to be decompressed.

tar -cjf etc.tar.bz /etc/

tar -cJf etc.tar.xz /etc/

The size of the compressed file will be smaller, but the time will be longer.

Unzip and unpack

tar -xf 1.tar

Such a compressed package is unzipped and unzipped to the current path

tar -tf etc.tar

Check which files and folders are in the compressed package.
linux software installation