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using standard input in shell script

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linux-howto

http://stackoverflow.com – I always run my shell with a command: ./shellName file1 file2 So, in the shell, I can refer file1 as $1 and file2 as $2. However, if I want to run the shell with this command ./shellName < file1 > file2 I tried to read the file1 as standard input and file 2 as standard output. How can I refer file1 and file2 in the shell script? Can I still use $1 and $2? Thanks in advance. (HowTos)

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Submitted by dadebian on 01/18/2013 – Made popular on 01/18/2013

Stories similar to using standard input in shell script

Hi Freinds,

i have a file1 as below file1

Code:

1|ndmf|fdd|d3484|34874 2|jdehf|wru7|478|w489 3|dfkj|wej|484|49894 file2 contains lakhs of records and not in sorted order i want to retrive only the records from file2 by searcing the first field of file 1

i used

Code:

grep ^1 file2 >out.txt grep ^2 file2 >>out.txt grep ^3 file2>>out.txt this i need to do 3 time

I'm quite new to Linux and specially to the shell and all of its commands. My goal is to move some files in every directory to another directory. To be more clear, I have this:

/DIR - /dir1 - file1 - file2 - ... - /dir2 - file1 - file2 - ... - ... - /dirn - file1 - file2 - ...

Hi Everyone!

I would like ask if there's a better way I can delete multiple lines in a file1 by collecting all criteria from file2.

file1: a b c d e f

file2: a e f

The expected value will be: b c d

The code below seems to work however if is taking much time when dealing with huge records.

I have file1 and file2 I lookup field3 from file2 in field1 of file1 and if there is a match, output field 2,3,5 from file2. I now want to add field2 of file1 in the output.

I suspect what I have to do is read the entire line of file1 into a 2 dim array? pls help.

Hi., I want to edit/replace strings into file.txt( or )file.cfg in middle of file with oldstring,using awk or sed command in shell script.

I am new to shell script ,here my sample example.

File1: aaa.c bbb.c ddd.c eee.c

file2: aaaaaaaaaaaaaaaaaaa dddddddddddddd INPUT ccccccccccccc dddddddddddddd

want to replace INPUT as aaa.c bbb.c ddd.c eee.c

tried the below c

Hi All,

I have two files in the directory file1.txt file2.txt

I gave ls -m > output.txt command and I got the output as file1.txt, file2.txt, output.txt

But my output should be like

file1.txt, file2.txt

Thanks in advance.

Hi , i am newbie to shell scripting and am trying to do the below job,

A shell script to be run with a command like

sh Compare.ksh file1.txt file2.txt 1 2 > file3.txt

1 2-are the key columns Consider the delimiter would be Tab or comma

File 1:

SK TEST NAME MATHS PHYSICS 21 1 AAA 45 65 21 2 AAA 48 66 22 1 BBB 46 64 22 2 BBB 47 65 23 1 CCC 58 85 23 2 CCC 59 88

File 2:

SK TEST NAME MATHS P

Hi , i am newbie to shell scripting and am trying to do the below job,

A shell script to be run with a command like

sh Compare.ksh file1.txt file2.txt 1 2 > file3.txt

1 2-are the key columns Consider the delimiter would be Tab or comma

File 1:

SK TEST NAME MATHS PHYSICS 21 1 AAA 45 65 21 2 AAA 48 66 22 1 BBB 46 64 22 2 BBB 47 65 23 1 CCC 58 85 23 2 CCC 59 88

File 2:

SK TEST NAME

I have two files like this

file1

a b c

file2

0 1 2

I want to output

a,0 b,1 c,2

Appending the two files like this

row(n) of file1 +","+ row(n) file2 for every n, total n is same in both files

I want to know is there any utility in shell which can help me do this, I do not want to use java file read file write for this or any loops. Can it be done using awk?