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copied!<p>All together:</p> <pre><code>$ awk '{for (i=1; i<=NF; i++) {if ($i) {print; next}}}' file | awk '{l=NR; c=NF; for (i=1; i<=c; i++) {a[l,i]=$i; if ($i) e[i]++}} END{for (i=1; i<=l; i++) {for (j=1; j<=c; j++) {if (e[j]) printf "%d ",a[i,j] } printf "\n"}}' </code></pre> <p>This makes the row checking:</p> <pre><code>$ awk '{for (i=1; i<=NF; i++) {if ($i) {print; next}}}' file 1 0 1 1 1 0 1 0 1 0 0 1 </code></pre> <p>It loops through all the fields of the line. If any of them are "true" (meaning not 0), it prints the line (<code>print</code>) and breaks to next line (<code>next</code>).</p> <p>This makes the column checking:</p> <pre><code>$ awk '{l=NR; c=NF; for (i=1; i<=c; i++) { a[l,i]=$i; if ($i) e[i]++ }} END{ for (i=1; i<=l; i++){ for (j=1; j<=c; j++) {if (e[j]) printf "%d ",a[i,j] } printf "\n" } }' </code></pre> <p>It basically saves all the data in the <code>a</code> array, <code>l</code> number of lines, <code>c</code> number of columns. <code>e</code> is an array saving if a column has any value different from 0 or not. Then it loops and prints all fields just when <code>e</code> array index is set, meaning if that column has any non-zero value.</p> <h3>Test</h3> <pre><code>$ cat a 1 0 1 0 1 0 0 0 0 0 1 1 1 0 1 0 1 1 0 1 1 1 0 0 0 0 0 0 0 0 0 0 1 0 1 $ awk '{for (i=1; i<=NF; i++) {if ($i) {print; next}}}' a | awk '{l=NR; c=NF; for (i=1; i<=c; i++) {a[l,i]=$i; if ($i) e[i]++}} END{for (i=1; i<=l; i++) {for (j=1; j<=c; j++) {if (e[j]) printf "%d ",a[i,j] } printf "\n"}}' 1 0 1 1 1 1 1 1 0 1 1 1 1 1 0 0 0 0 1 1 </code></pre> <p>previous input:</p> <pre><code>$ cat file 1 0 1 1 0 0 0 0 1 0 1 0 0 0 0 0 1 0 0 1 $ awk '{for (i=1; i<=NF; i++) {if ($i) {print; next}}}' file | awk '{l=NR; c=NF; for (i=1; i<=c; i++) {a[l,i]=$i; if ($i) e[i]++}} END{for (i=1; i<=l; i++) {for (j=1; j<=c; j++) {if (e[j]) printf "%d ",a[i,j] } printf "\n"}}' 1 1 1 1 1 0 1 0 1 </code></pre>

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