Linux Common Commands-echo/printf/file

Echo: Display text

NAME
Echo-display a line of text

Synopsis
echo [Short-option] ... [STRING] ...
Echo long-option

-N

[Email protected] doc]# echo-n
[Email protected] doc]# Echo

[Email protected] doc]#

[Email protected] doc]# Echo-n "This was 2017,\n the day is Feb 11"
This was 2017,\n the day was 11[[email protected] doc]#

-E: text Open escape character

[[email protected] doc]# echo "This is 2017,\n, the day is Feb 11"
This was 2017,\n the day was Feb 11
[Email protected] doc]# ECHO-E "This was 2017,\n the day is Feb 11"
This is 2017,
The day is Feb 11

printf: Formatting and displaying text

printf (1) User Commands printf (1)

NAME
Printf-format and print data

Synopsis
printf FORMAT [ARGUMENT] ...
printf OPTION

[[email protected] doc]# printf "This year was 2017,the day is Feb 11"
This was 2017,the day was Feb 11[[email protected] doc]#

File type determination

This command is used to identify file types and to identify the encoding format of some files. It does this by looking at the header information of the file to get the file type, rather than identifying the file type as Windows does by extension.

NAME
File-determine file type

Synopsis
file [-bchiklnnprsvz0] [--apple] [--mime-encoding] [--mime-type] [-e testname] [-F separator]
[-F NameFile] [-M magicfiles] file ...
file-c [-M magicfiles]
file [--help]

ELF: Executable Link file

[Email protected] ~]$ File/bin/ls
/bin/ls:elf 64-bit LSB executable, x86-64, version 1 (SYSV), dynamically linked (uses shared libs), for Gnu/linux 2.6.18, Stripped

Linux Common Commands-echo/printf/file