sed

another_file:

text from another file!

t_file:

abb ccc Josephjosephlast linedate: 12-11-2011DATE:12/11/2011 1234511 --> 221110111

sed cmd:

#print out the lines matched sed -n '/[jJ]oseph/p' t_file#delete specified linessed '1,3d' t_file#print last linesed -n '$p' t_file#print the matched linessed -n '/joseph/p' t_file#print all lines, and print the matched lines twice.sed  '/joseph/p' t_file#campare the result...sed 's/[jJ]oseph/& Yang/g' t_filesed -n 's/[jJ]oseph/& Yang/g' t_filesed 's/[jJ]oseph/& Yang/gp' t_filesed -n 's/[jJ]oseph/& Yang/gp' t_file#analyze to the cmd abovesed -n 's/\([jJ]oseph\)/Yang \1/gp' t_file#change the default delimitersed -n 's-1-2-gp' t_filesed -n 's/1/2/gp' t_file#print lines from '3' to '5'sed -n '/3/,/5/p' t_filesed -n '/3/,/5/s/$/###tail###/p' t_filesed -e 's/11/%%/g' -e  's/\(%%\)/##\1##/pg' -n  t_filesed -e 's/11/%%/g' -e  's/\(%%\)/##\1##/p' -n  t_file#file readingsed '/4/r another_file' t_file#file writingsed -n '/3/,/4/w file_write'  t_file && cat file_write#append operationsed '/5/a  \                                  ---> append one line after <-----' t_file#insert the contents before the specified linesed '/5/i  \---> append one line before <-----' t_file#change the contentssed '/5/c  \---> change one line <-----' t_file# 'n' cmd, sed command will applied to the matched line's next linesed  '/^date/ { n; s/\/2011$/\/change next line /p; }' t_file# xhg charsed 'y/01/xy/' t_file#match the line has 'Joseph', change 'joseph' to 'hofrat'#  in the matched line's next line, and sed exit  sed '/Joseph/{ n; s/joseph/hofrat/; q ; }' t_file#when read one line from the file, sed place the line to mode buffer(size 8192Bytes)# and the sed command applied on this line. # There exist another buffer named holding buffer(size 8192B)# 'h' cmd will save the line in the mode buffer to the holding buffer.# 'g' cmd will excute the oppsite operation.sed -e '/DATE/ {h;d;}' -e '/11011/{g;}' t_filesed -e '/DATE/ {h;d;}' -e '/11011/{x;}' t_file # 'g' or 'x' # the cmd above, do the following operation:# the line contains 'DATE' will firstly be placed to the  mode buffer and then# placed to holding buffer by 'h' cmd. The line in mode buffer will be deleted by # cmd 'd'. # then, excute the next sed cmd.# when line contain '11011' be matched, the line will be replaced by the line# we stored in the holding buffer before.#NOTE: cmd 'G' just print the line which we save in holding buffer after the matched line.sed -e '/DATE/ {h;d;}' -e '/11011/{G;}' t_file

sed  script file

sed_script

#my firs sed script/DATE/ {h;d;} /11011/{G;}

How to execute the script:

#chmod +x sed_script

# sed -f sed_script t_file