Rename beginning of file name using specific text in the file itself

renamesedtext processing

I have many files in directory (file1.txt, file2.txt, …)

Every files contains bunch of lines. One of the line is specific text thetext followed by random number just like thetext56, thetext21, etc.

I want to rename beginning of the file name using specific text in the file itself. So, file1.txt will be thetextXXfile1.txt, file2.txt will be thetextXXfile2.txt, and so on.

Simple rename command to add addtext on the beginning is

rename 's?^?addtext?' *.html

while getting that specific text in the files is

sed '/thetext/!d' *.html

but I have no idea how to combine both of them.

Best Answer

I would suggest that grep is a better tool for sed when what you want to do is read one line out of a file based on a match. You are welcome to substitute your sed in the loop structure below. Note that I also used the -m 1 option so that grep only bothers looking as far as the first match:

for file in *.html; do
   text="$(grep -m 1 "thetext" "$file")"
   rename "s?$text?" "$file"
done

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Adjust gap between 2 columns to make them look straight

awk 'FNR==1{f+=1;w++;}
     f==1{if(length>w) w=length; next;}
     f==2{printf("%-"w"s",$0); getline<f2; print;}
    ' f2=file2 file1 file1

Note: file1 is quite intentionally read twice; the first time is to find the maximum line length, and the second time is to format each line for the final concatenation with corresponding lines from file2. — file2 is read programatically; its name is provided by awk's variable-as-an-arg feature.

Output:

hi             1
wonderful      2
amazing        3
sorry          4
superman       5
superhumanwith 6
loss           7

To handle any number of input files, the following works.but *Note: it does not cope with repeating the same filename. ie each filename arg refers to a different file. It can, however, handle files of different lengths - beyond a files EOF, spaces are used.

awk 'BEGIN{ for(i=1; i<ARGC; i++) { 
              while( (getline<ARGV[i])>0) { 
                 nl[i]++; if(length>w[i]) w[i]=length; }
              w[i]++; close(ARGV[i])
              if(nl[i]>nr) nr=nl[i]; }
            for(r=1; r<=nr; r++) {
              for(f=1; f<ARGC; f++) {
                if(r<=nl[f]) getline<ARGV[f]; else $0=""  
                printf("%-"w[f]"s",$0); } 
              print "" } }
    ' file1 file2 file3 file4

Here is the output with 4 input files:

hi             1 cat   A 
wonderful      2 hat   B 
amazing        3 mat   C 
sorry          4 moose D 
superman       5       E 
superhumanwith 6       F 
loss           7       G 
                       H

Best Answer

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Adjust gap between 2 columns to make them look straight

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