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    <p>First the extra sub-shell can be avoided:</p> <pre><code>#!/bin/bash signature="Trojan.Bancos-166:1:*:3d415d736715ab5ee347238cacac61c7123fe35427224d25253c7b035558baf19e54e8d1a82742d6a7b37afc6d91015f751de1102d0a31e66ec33b74034b1ab471cc1381884dfdf0bb3e4233bd075fef235f342302ffd72ecabfa5aedf1b3dc99b3348346db4d9001026aef44c592fee61493f7262ad2bd1bce8a7ce60d81022533f6473ae184935f25cf6cc07c3aebfdf70a5a09139" variable=$(echo "${signature//*:/}" | sed 's/\(..\)/\\x\1/g;') </code></pre> <p>Require only confirmation of a match:</p> <pre><code>if grep -qU "$variable" "$raw_file_path"; then # matches fi </code></pre> <p>Or require the result for further processing:</p> <pre><code>test_var=$(grep -U "$variable" "$raw_file_path") # contents of match in test_var </code></pre> <p>When returning to a variable, greps <code>-q</code> opt suppresses stdout</p> <p><strong>Edit</strong></p> <p>Tested working example</p> <pre><code>&gt; signature="Trojan.Bancos-166:1:All_text before-the last : should be trimed:3d415d736715ab5ee347238cacac61c7123fe35427224d25253c7b035558baf19e54e8d1a82742d6a7b37afc6d91015f751de1102d0a31e66ec33b74034b1ab471cc1381884dfdf0bb3e4233bd075fef235f342302ffd72ecabfa5aedf1b3dc99b3348346db4d9001026aef44c592fee61493f7262ad2bd1bce8a7ce60d81022533f6473ae184935f25cf6cc07c3aebfdf70a5a09139" \ &gt; hex_string=$( echo "${signature//*:/}" | sed 's/\(..\)/\\x\1/g;' ) \ &gt; echo "$hex_string" \x3d\x41\x5d\x73\x67\x15\xab\x5e\xe3\x47\x23\x8c\xac\xac\x61\xc7\x12\x3f\xe3\x54\x27\x22\x4d\x25\x25\x3c\x7b\x03\x55\x58\xba\xf1\x9e\x54\xe8\xd1\xa8\x27\x42\xd6\xa7\xb3\x7a\xfc\x6d\x91\x01\x5f\x75\x1d\xe1\x10\x2d\x0a\x31\xe6\x6e\xc3\x3b\x74\x03\x4b\x1a\xb4\x71\xcc\x13\x81\x88\x4d\xfd\xf0\xbb\x3e\x42\x33\xbd\x07\x5f\xef\x23\x5f\x34\x23\x02\xff\xd7\x2e\xca\xbf\xa5\xae\xdf\x1b\x3d\xc9\x9b\x33\x48\x34\x6d\xb4\xd9\x00\x10\x26\xae\xf4\x4c\x59\x2f\xee\x61\x49\x3f\x72\x62\xad\x2b\xd1\xbc\xe8\xa7\xce\x60\xd8\x10\x22\x53\x3f\x64\x73\xae\x18\x49\x35\xf2\x5c\xf6\xcc\x07\xc3\xae\xbf\xdf\x70\xa5\xa0\x91\x39 </code></pre>
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