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For the fun of it; the (admitted lengthy) "command substitution" finds the last line prior to the date/time given in DT1 on which sed needs to quit:
DT1="Jan 19 21:10:00"
sed "/$(echo "$DT1" | cut...

That looks like a good approach.

You could get some more efficiency by not calling the date external on each input line and using bash to convert the date time to an mmddHHMMSS number for direct...

Because arguments are passed as strings, embedded spaces are lost normally.
The original script makes an attempt to retain arguments with embedded special characters.
The improved original script...

Looks extremely kludgy and pointlessly overcomplicated, I don't recommend it. This does the exact same thing without most of the nonsense and security holes.

#!/bin/sh

SCRIPT="$1"
U="$2"...

This might be a suitable script to do what the comments in your code say it is trying to do:
#!/bin/bash
echo "This is a shell script to remove numbers divisible by 2 from an array"
if [ $# -gt 0...

I don't think your code works as well as you think it does. Try running your script again telling it that you want it to process 5 numbers and then enter the same number 5 times. Do you get the...

You are
- using "Arithmetic Expansion" in lieu of "Command Substitution"
- NOT expandig the variables num1 and num2

And if you *want* bc, maybe for handling very long numbers, then it is
num1=12345678901234567890
num2=46
mod_final=$( echo "$num1%$num2" | bc )
=>Command substitution.

Yes, and as you have already received the solution i wil concentrate on explaining the reason:

When you invoke a process with some arguments these arguments become part of the "process...

There are no array operations for the not-that-common things you want to do. You'll need to take the scenic route, as did jgt, if you don't play tricks.

If you just need an array to hold the...

grep builds one overall pattern to match in the file(s) and thus can only yield one count. Use either four greps, one for every single keyword, or try
awk -vKEYS="Exception Fatal Error Exec" '...

Hi.

Using a pipeline grep -> sort -> uniq:
#!/usr/bin/env bash

# @(#) s1 Demonstrate count of 4 unique strings, grep, sort, uniq.

# Utility functions: print-as-echo,...

bash already supports associative arrays, so IMO the need for linked lists may not be all that critical. Chubler XL gave a really good take on it.
Associative arrays require bash v4

declare -A...

I'd use arrays. One for the values and one for the next index.


Here is an example of a sorted linked list:

llinsert() {
local END=${#LST[@]}
local i

for((i=0; NXT[i];...

Hi.

As with other non-oracle solutions such as awk, perl, here is datamash:
#!/usr/bin/env bash

# @(#) s1 Demonstrate statistics for grouped data, datamash.

# Utility functions:...

perl -nalF',' -e '
print "@F[0],MIN,MAX" and next if $. == 1;
push @{$o{$F[0]}}, $F[1];
END{ for( sort keys %o ){ @so = sort @{ $o{$_} };
$l = $so[-1] ? $so[-1] : $so[0];
print...

awk -F, -f muk.awk myFile OFS=, where muk.awk is:

FNR>1 {
if (!($1 in amin))
amin[$1]=amax[$1]=$2
else {
if($2<amin[$1]) amin[$1]=$2
if($2>amax[$1]) amax[$1]=$2
}...

Hi, try:
awk '
NR==1 {
next
}

!($1 in L) {
L[$1]=$2
}

$2<L[$1] {
L[$1]=$2
}

$2>=H[$1] {
H[$1]=$2
}

END {
for(i in L) print i, L[i], H[i]

I have actually written a whole article about exactly this:

https://www.unix.com/tips-and-tutorials/209439-how-do-control-break-algorithm.html

I hope this helps.

bakunin

A vast amount of problems asked in "Shell Programming an Scripting" can be traced back to be an application of a basic algorithm called a Control Break. Every programmer - and script writers are...

Try

find /home/arpu/test -type f -name '*.txt' | while read f; do mv -v "$f" "${f%.*}.bak"; done

-type f is there so there is not chance of renaming a directory named something.txt, if exists

This will look for lines, in the file named by $fname, not matching (-v) the strings (that's the use of fgrep) contained in the file (-f) infile, and redirect those lines to tmp.tmp.

Try this:-

#!/bin/bash
while read line
do
for i in $(find /tmp/myproject/content_to_remove/config/ -type f)
do
DIR=`echo $i | sed 's|\(.*\)/.*|\1|'`
sed...

Read the man page for split.

for i in $(find statement)
do
new_name=$(echo $i | sed 's/-e/-l/g')
echo "mv $i $new_name"
done
if you are getting your required result. Just remove echo.:)