text_processing.txt

Text Processing

SED
:  # label
=  # line_number
a  # append_text_to_stdout_after_flush
b  # branch_unconditional             
c  # range_change                     
d  # pattern_delete_top/cycle          
D  # pattern_ltrunc(line+nl)_top/cycle 
g  # pattern=hold                      
G  # pattern+=nl+hold                  
h  # hold=pattern                      
H  # hold+=nl+pattern                  
i  # insert_text_to_stdout_now         
l  # pattern_list                       
n  # pattern_flush=nextline_continue   
N  # pattern+=nl+nextline              
p  # pattern_print                     
P  # pattern_first_line_print          
q  # flush_quit                        
r  # append_file_to_stdout_after_flush 
s  # substitute                                          
t  # branch_on_substitute              
w  # append_pattern_to_file_now         
x  # swap_pattern_and_hold             
y  # transform_chars                   

sed 's/pattern/replacement/g' file


AWK
awk '{gsub(/pattern/,"replacement")}' file





ONE-LINERS
	url decoder
sed 's@+@ @g;s@%@\\x@g' file | xargs -0 printf "%b"
sed -e's/%\([0-9A-F][0-9A-F]\)/\\\\\x\1/g' file | xargs echo -e
alias urldecode='sed "s@+@ @g;s@%@\\\\x@g" | xargs -0 printf "%b"'