abrenar

 Profile Answers by abrenar Questions by abrenar

• Nov 4th, 2009

Most UNIX servers are configured not to use FTP or TELNET for security purposes, and if you use FTP it has limited number of data can be transfered on one transaction hence I preferred using another w...

UncaAlby

 Profile Answers by UncaAlby Questions by UncaAlby

• Nov 8th, 2008

If you can't get Samba, or you're not the Admin so you can't install it anyway, then use FTP, as it's almost guaranteed to be installed and running on both machines.  The only han...

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amita

• Apr 2nd, 2016

DOS style backslashes to UNIX style: vi filename escape:%s/ctrlm//g/ enter ------------------------------- Directory comparision diff -r dir1 dir2 --------------------------------------- last line ad...

sorkan

 Profile Answers by sorkan Questions by sorkan

• Sep 7th, 2009

dos2unix only removes the control-M characters at the end of the line.  You need to use sed to do the search and replace for '' to '/'.

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In shell scripting How to indentify that the previous command was run successfully?

Yogesh

• Oct 4th, 2017

Echo $?
if answer 0 then last command was successful.
if answer is any numeric value then last command is not successful.

abdas

 Profile Answers by abdas Questions by abdas

• Jun 26th, 2011

in 2 ways it can be done:1st way$ echo $?  2nd way:$ pwd 2> error| cat error|wc -l       0$ cat h 2> error| cat error|wc -l       1pwd or cat or any command if outpt is 0 then successful else failed.

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Kantha

• Sep 18th, 2013

$? :- provide exit status of last executed command In case the last command successfully executed then the value is 0 , if its failed to execute then the value non-zero. Example: ...

saravanan

• Jul 9th, 2013

It gives exit status of the command.

Use echo $? to get exit status of the script

Hint : if you get 0 then success, 1 means failure and some outputs

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How many users have logged in and logged out in last five or 10 minutes

sahilgaix

 Profile Answers by sahilgaix Questions by sahilgaix

• Oct 15th, 2015

# To find out who logged in/logged out in last 5 minutes(including who is currently logged in) last|while read line do echo $line|grep "still logged in" > /dev/null if [ $? -eq 0 ] then echo...

Ataul

• May 21st, 2015

Who | wc -l | last -5
#to get the counts of who are still logged in

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abdas

 Profile Answers by abdas Questions by abdas

• Jul 25th, 2011

Code
 

iamjogi

 Profile Answers by iamjogi Questions by iamjogi

• Aug 23rd, 2009

Try this:echo "one two three" | xargsthe output is: one two three

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Manisha Kumari

• Jun 15th, 2017

In Esc mode, dw

sambit

• Mar 28th, 2017

Sed command with -i option will make the changes persistent in the file. You dont need the redirection operator to submit the changes to a new file. The answer is:

sed -i s/word_to_delete/word_to_replace_with/g file_name

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Want to delete the record if I find a word (dd)in the length(5-7). Lets think that (5-7) length is FF2.
This is a fixed width file.

ex f1

ff1 ff2 ff3
sds dd fd
sd ss ew
dd dd se

o/p should be like


ff1 ff2 ff3
sd ss ew

pranav Rakesh

• Sep 26th, 2017

Sed /[dD]$/d file

shailesh chanderiya

• Aug 26th, 2017

Line_no=` sed -n /^...*dd/=;p temp | sed -n /^[0-9]/p |xargs|sed s/ /d;/g;s/$/d/`
sed -i "${line_no}" temp

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Write a small shell script that adds an extension ".new" to all the files in a directory.

Nawaz

• Jun 9th, 2017

For f in *; do mv $f ${f}.new; done

Nawaz

• Oct 25th, 2016

For item in `ls`; do mv $item ${item}.new; done

Code
 

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Read Best Answer

Editorial / Best Answer

Answered by: Suman Saha

• Jun 27th, 2005

---

cat filename.txt | cut -c 10-20

Anil Kumar

• Feb 3rd, 2016

Cut -c 10-20 filename

Bharat

• Sep 21st, 2015

Cat 1.txt | cut -c 10-20.

The question is about the character positions and not the lines from 10 to 20

Improve Answer

How to print nth column of a pattern/file without using awk,cut commands?

Sathish Krishnan Venkatachalam

• Aug 7th, 2020

I hope the below answer, to retrieve 3rd column without using awk (or) cut, use the following command:
sed s/^(.*) (.*) (.*) (.*)$/3/g file.txt
insert or delete "(.*)" based on which column to be retrieved and change "3" to nth column no.

Ashok

• May 27th, 2018

Sed -n np file.txt

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You have current directory containing set of directories which contain files.One file can reside in many directories.Write script which returns number of unique file names inall the subdirectories of a current dir.

Sathish Krishnan Venkatachalam

• Aug 7th, 2020

Ls -lR | awk /^-/ {print $NF} | uniq

sonu

• Mar 1st, 2018

Find . -type f | awk -F / { print $NF } | sort | uniq -c

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Sathish Krishnan Venkatachalam

• Aug 7th, 2020

Grep "^$" file.txt

mallikarjuna reddy

• Jul 23rd, 2019

Grep -n ^$ file1.txt this command will give the all empty lines numbers display
grep -n ^$ file1.txt | wc -l this command will give the all empty lines number counts in file

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sambit

• Mar 28th, 2017

You dont need /g at the end for removing only the nth occurrence. You need g for replacing globally. The answer is:

sed s/string_to_replace/string_to_replace_with/n file_name

where "n" is the position where you want to do the replacement.

pankaja das

• Jan 30th, 2015

Sed s/xyz/n/g filename

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Gaurav Sharma

• May 16th, 2017

Use the below statement in program body.
echo $*|rev

anu

• Sep 16th, 2015

#!/bin/sh
#to print arguments in stdin in reverse order
for token in `echo $*| rev`
do
echo $token
done

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armaan mahajan

• May 22nd, 2017

#!/bin/bash

echo "please enter the string"

read string

string_new=$string

reverse_string=`echo $string|rev`

if [ $reverse_string -eq $string_new ];

then

echo "String is palindrome"

else

echo "string is not palindrome"

fi

sujit kumar

• May 4th, 2017

#!/bin/bash
echo -n "Enter a string: "
read str
if [ $(echo $str | rev) = $str ]
then
echo "$str is palindrome."
else
echo "$str is not palindrome"

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Nasirjamal MohdSiraj

• May 25th, 2017

Head -2 test | tail -1

Tarun Thakur

• Mar 28th, 2017

Sed -n 2p filename

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Ravindar

• Jan 2nd, 2017

Vi -R filename
This will open the file in read mode in vi editor(which is available in almost all unix version)

Akula Uday

• Nov 24th, 2016

View filename

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Shwetha N A

• Jun 25th, 2021

Tail +25 filename | head -1

Ashok

• May 27th, 2018

Sed -n 25p filename.txt

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