[LPIC 101] I tried to summarize the command options that are easy to make a mistake

Introduction

To receive LPIC 101, you must remember the commands and their options and subcommands. Most of the option subcommands are hijacked in English, so it's not difficult if you get the hang of it.

Example: -i → Abbreviation for information. Display information. Abbreviation for -l → list. List display. etc

However, there are option subcommands that are difficult to think of with such ordinary English rules, and it seems that LPIC is likely to be asked as a problem. This time, I would like to pick up and post commands that I find particularly easy to make mistakes and difficult to remember.

(I personally thought it was easy to make a mistake and it was hard to remember. Some people don't think it's easy to make a mistake, and it may be easier to make a mistake with another command option than the one posted. Please note that.)

cp

option content
-i If there is a file with the same name in the copy destination, check whether to overwrite it
-d When copying a symbolic link, copy the entity
-a Copy the original file attributes and directory structure as much as possible

cut

option content
-c Specify the character position to extract
-d Specify the delimiter

egrep

option content
-v Show unmatched lines

fdisk

subcommand content
m List of available commands
n Create partition
p Display partition table

find

option content
type -l Search for symbolic links

fsck

option content
-N Only the content to be executed is displayed without actually executing it.

grep

option content
-c Show only the number of matching rows
-v Show unmatched lines
-i Search case-insensitive

mkdir

option content
-m Create a directory with permissions
-p(--parents) Created if the described directory does not exist without displaying an error

rpm

option (suboption) content
-e(--erase) Uninstall package
-c(--configfiles) Show only configuration file

Finally

I am studying LPIC, so I will add it if necessary.

reference

https://eng-entrance.com/linux-command-mkdir https://eng-entrance.com/linux-command-cut https://eng-entrance.com/linux-command-grep https://xtech.nikkei.com/it/article/COLUMN/20060227/230775/ https://qiita.com/kyohmizu/items/923844999018fd456d44

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