dir bookmarks re: bash

gistfile1.txt

#simple bookmarking                                                                                                                                                                                         
function bookmarklist {                                                                                                                                                                                     
    i=0                                                                                                                                                                                                     
    while ((i++)); read -r line; do                                                                                                                                                                         
        echo "$i: $line"                                                                                                                                                                                    
    done < /tmp/bookmarks                                                                                                                                                                                   
}                                                                                                                                                                                                           
function bookmarkopen() {                                                                                                                                                                                   
    line=$(sed -n "$1p" < /tmp/bookmarks)                                                                                                                                                                   
    cd $line                                                                                                                                                                                                
}                                                                                                                                                                                                           
function bookmarkpop() {                                                                                                                                                                                    
    line=$(sed -n "$1p" < /tmp/bookmarks)                                                                                                                                                                   
    sed -i "" "$1d" /tmp/bookmarks                                                                                                                                                                          
    cd $line                                                                                                                                                                                                
}                                                                                                                                                                                                           
function bookmarkdelete() {                                                                                                                                                                                 
    sed -i "" "$1d" /tmp/bookmarks                                                                                                                                                                          
}                                                                                                                                                                                                           
                                                                                                                                                                                                            
# bookmark-related                                                                                                                                                                                          
alias ba="pwd >> /tmp/bookmarks"                                                                                                                                                                            
alias bl="bookmarklist"                                                                                                                                                                                     
alias bo="bookmarkopen"                                                                                                                                                                                     
alias bp="bookmarkpop"                                                                                                                                                                                      
alias bd="bookmarkdelete"