Command aliases and History commands

1. Command alias settings: Alias,unalias

1) Definition Rules for command aliases # alias lm= ' ls-l | More ' 2) See what command Aliases # ALIAS3) Cancel the command alias # unalias LM 2. Historical command: History1) List all current memory # History2) List the most recent 3 data # History 33) Immediately write the current data to Histfile # history-w# by default, the historical record is written to ~/.bash_history.      4) Use! Execute command # history66 man rm67 alias68 Mans history69 history#!66 <== execute 66th command #!! <== executes the previous command, in this case!66#!al <== executes the most recent command starting with Al (67th listed above)

Command aliases and History commands