How to efficiently modify the file?

alias as follows

# 备份
alias bak='bak(){cp $1 $1.bak;};bak $@'
# 交换两个文件的名称
alias swap='swap(){tmp=$(mktemp -u);mv $1 $tmp;mv $2 $1;mv $tmp $2};swap $@'
# 备份恢复
alias unbak='unbak(){swap $1.bak $1;};unbak $@'
# 与备份文件比较
alias bakdiff='bakdiff(){meld $1.bak $1 >/dev/null 2>&1;};bakdiff $@'