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copied!<p>This might work for you:</p> <pre><code># sed '\|\(.*\)\($/.*\)|{h;x;s//\2/;x;s//\1/;:a;s/^.\{1,78\}$/ &/;ta;s/^\( *\)\(.*\)/\2\1/;G;s/\n//}' params c ------------------ c Something stupid c ------------------ c there is a number: 9 $/ar_numb/ c a line that looks 1 px 0.9814 $/r_a/ 2 px -0.9814 $/r_a/ 3 p 1 1.732051 0 1.9628 $/x2r_a/ 4 p 1 1.732051 0 -1.9628 $/x2r_a/ 5 p -1 1.732051 0 1.9628 $/x2r_a/ 6 p -1 1.732051 0 -1.9628 $/x2r_a/ c c dirty line 7 cz 0.9347 $/x05d_a/ c very dirty 41 p 0 $/A_Nel/!jl 1 $/B_Nel/!jl 0 $/C_Nel/!jl 0 $/D_Nel/!jl $bad element 42 p 1.723051 $/A_NEel/!jl 1 $/B_NEel/!jl 0 $/C_NEel/!jl 0 $/D_NEel/!jl $kokode nanika kaite kudasai # printf "%.1s" {1..90} 123456789111111111122222222223333333333444444444455555555556666666666777777777788888888889# </code></pre> <p>Explanation:</p> <ol> <li>Only edit those lines that contain <code>$/...</code></li> <li>Copy the line into the hold space (HS).</li> <li>Swap to the HS and delete everything but the string <code>$/....</code></li> <li>Swap back to the pattern space (PS) and do the reverse i.e. delete <code>$/...</code></li> <li>Indent the PS with spaces to the 79th column</li> <li>Swap the spaces at the front of the PS with the non-spaces.</li> <li>Append the HS to the PS i.e. add the <code>$/...</code> string to the end of the line.</li> <li>Delete the embedded newline caused by the <code>G</code> command.</li> </ol> <p>Alternatively:</p> <pre><code>sed '\|\(.*\)\($/.*\)|!{s/.*/printf "%s\n" "&"/;b};s//printf "%-79s%s\n" "\1" "\2"/' params | sh </code></pre> <p>Or with GNU sed:</p> <pre><code>sed '\|\(.*\)\($/.*\)|{s//printf "%-79s%s" "\1" "\2"/e}' params </code></pre>

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