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POfetch nth line of a text file using non-interactive shell script
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copied!<p>i need to fetch the nth line of a txt file using shell script.</p> <p>my text file is like</p> <pre><code>abc xyz </code></pre> <p>i need to fetch the 2nd line and store it in a variable</p> <p>i've tried all combinations using commands like : </p> <ol> <li>sed </li> <li>awk </li> <li>head </li> <li>tail</li> <li>cat</li> </ol> <p>... etc</p> <p>problem is, when the script is called from the terminal, all these commands work fine. but when i call the same shell script, from my java file, these commands do not work.</p> <p>I expect, it has something to do with the non-interactive shell.</p> <p>Please help</p> <p>PS : using read command i'm able to store the first line in a variable.</p> <pre><code>read -r i<edit.txt </code></pre> <p>here , "i" is the variable and edit.txt is my txt file.</p> <p>but i cant figure out, how to get the second line.</p> <p>thanks in advance</p> <p>edit : ALso the script exits, when i use these "non-working" commands, And none of the remaining commands is executed.</p> <p>already tried commands : </p> <pre><code>i=`awk 'N==2' edit.txt` i=$(tail -n 1 edit.txt) i=$(cat edit.txt | awk 'N==2') i=$(grep "x" edit.txt) </code></pre> <p>java code:</p> <pre><code>try { ProcessBuilder pb = new ProcessBuilder("./myScript.sh",someParam); pb.environment().put("PATH", "OtherPath"); Process p = pb.start(); InputStreamReader isr = new InputStreamReader(p.getInputStream()); BufferedReader br = new BufferedReader(isr); String line ; while((line = br.readLine()) != null) System.out.println(line); int exitVal = p.waitFor(); }catch(Exception e) { e.printStackTrace(); } } </code></pre> <p>myscript.sh</p> <pre><code>read -r i<edit.txt echo "session is : "$i #this prints abc, as required. resFile=$(echo `sed -n '2p' edit.txt`) #this ans other similar commands donot do anything. echo "file path is : "$resFile </code></pre>

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