Enter text in a file in a certain column Shell script

Question

Enter text in a file in a certain column Shell script

Navigation

#1 by (1 votes)

1

I have to modify column 5 of a separate text file with : (colon). For the text that the user enters, I already cut column 5 with cut -f5 -d: , but I do not know how to enter the text in that empty space that remains.

The text that the user enters is stored in a variable.

linux shell

asked by Paxa 03.11.2016 в 20:20

source

1 answer

How do I send data from a modal window with ajax and php to mysql? Android How to modify the contents of a Drawer Menu from a Fragment?

score 1 · Answer 1

Use awk :

awk -v nuevo_valor="NOCHE" 'BEGIN{FS=OFS=":"}{$5=nuevo_valor}1' archivo

How does this work?

-v nuevo_valor="NOCHE"
provides the script with the value to replace the column with.
BEGIN{FS=OFS=":"}
define the field separator; in this case, two points.
{$5=nuevo_valor}
assigns to the 5th field the given value with the variable nuevo_valor .
1 evaluates to True (true) so it executes the default command of awk : {print $0} ; that is, write the current record.

For example:

$ cat archivo
hola:como:estas:esta:mañana:yo:bien
$ awk -v nuevo_valor="NOCHE" 'BEGIN{FS=OFS=":"}{$5=nuevo_valor}1' archivo
hola:como:estas:esta:NOCHE:yo:bien