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I have a script that does db query in postgres. I'm trying to put in some error checking in the script. I keep running into the password prompt problem where when invalid credentials/or database is...

Thanks a lot for your help guys! I'll try to customize it to fit what i need

Hi I'm trying to compare 3 or more files based on similar values and outputting them into 3 columns.

For example:
file1
ABC
DEF
GHI

file2
DEF
DER

file3
ABC
DER

The output should...

Thanks! that worked great. Do you mind explaining how does the length option work?

I have a file called file.txt with multiple lines in them. I'm trying to remove the first 2 characters and the last 2 with awk.


'.batman')
'.superman')
'.dragonheart')
.'superduper')
I tried...

This might be a simple answer but I can't for my life figure it out. If I input "bat", how do I get the condition to pick it up with the wild card *at*.


#!/bin/bash

read -p "enter" BOO

if...

THANKS!!

I have a folder that has new files created everyday, is there a way i can filter them so that only the 5 newest files are displayed? I'm hoping this can be done by a one liner without a script.
...

I tried the above, but if I do

echo ABC >> file.txt

it is not showing any live output, ABC is being written to file.txt, but the tail -f does not seem to work with tr.

Sorry I actually made a mistake in my original post. The output should only show the lines that contain 'C' also.

by just running tail -f file | tr B F will putput the ZZZ lines as well.

I have file that is being constantly written to

example: file.txt
ABC
EBC
ZZZ
ABC

I am trying to create a simple script that will tail this file and at the same time using tr to change B...

thank you. worked perfectly

I basically have a file where I had to do a bunch of greps to get a list of numbers

example: a file called numbers.txt

10000
10000
superman
10000
batman
10000
10000

grep '100' * |
...