angelcool@fedora-laptop$cat FILE1.txt 
1
2
3
4
5
5
angelcool@fedora-laptop$cat FILE2.txt 
1
2
3
4
5
6
7
8
9
angelcool@fedora-laptop$comm -13 <(sort FILE1.txt|uniq) <(sort FILE2.txt|uniq)
6
7
8
9
angelcool@fedora-laptop$ man comm
...
       Compare sorted files FILE1 and FILE2 line by line.

       When FILE1 or FILE2 (not both) is -, read standard input.

       With  no  options,  produce three-column output.  Column one contains lines unique to FILE1, column two con‐
       tains lines unique to FILE2, and column three contains lines common to both files.

       -1     suppress column 1 (lines unique to FILE1)

       -2     suppress column 2 (lines unique to FILE2)

       -3     suppress column 3 (lines that appear in both files)

       --check-order
              check that the input is correctly sorted, even if all input lines are pairable

       --nocheck-order
              do not check that the input is correctly sorted

       --output-delimiter=STR
              separate columns with STR

       --total
              output a summary

       -z, --zero-terminated
              line delimiter is NUL, not newline

       --help display this help and exit

       --version
              output version information and exit

       Note, comparisons honor the rules specified by 'LC_COLLATE'.
...

[aesteban@localhost ~]$ 
[aesteban@localhost ~]$ for i in {1..6};do ( echo 'delete events.slick-range') | nc  server-${i}.example.com 11211; done;
NOT_FOUND
NOT_FOUND
NOT_FOUND
DELETED
NOT_FOUND
NOT_FOUND
[aesteban@localhost ~]$ 
[aesteban@localhost ~]$ 
[aesteban@localhost ~]$ 

[aesteban@localhost ~]$ 
[aesteban@localhost ~]$ for i in {1..6};do ( sleep 2; echo 'delete events.slick-range') | nc -d 2  server-${i}.example.com 11211; done;
NOT_FOUND
NOT_FOUND
NOT_FOUND
DELETED
NOT_FOUND
NOT_FOUND
[aesteban@localhost ~]$ 
[aesteban@localhost ~]$ 
[aesteban@localhost ~]$ 

(sleep 1; echo "stats cachedump 7 0"; sleep 1; echo "quit";) | nc www-server01.example.com  11211 | grep 'memc.sess.tpnm0jd8aottlturb0ml510sd0'

cd logos;

while read line; do

   # test if line starts with "assets"
   if [[ $line =~ ^asset.* ]]; then
     #prepend domain
     line="http://www.soy-example.com/$line"
   fi
  
   # test if line starts with "/assets"
   if [[ $line =~ ^/asset.* ]]; then
     # prepend domain
     line="http://www.soy-example.com$line"
   fi
  
   # download this sucker
   wget $line

done < ../soyFranquiciasLogos.txt

$1, $2, $3, ... 

"$@" 

"$*" 

$# 

$- 

$$ 

$_ 

$IFS 

$? 

$!

$0

#!/usr/bin/bash

sum()
{
   echo $1 + $2 | bc
}

# call function and pass cli
# parameters to function
sum $1 $2

[aesteban@localhost ~]$ ./sum.sh 1.4 1.3
2.7

#!/usr/bin/bash

sum()
{
   RESULT=$(echo $1+$2 | bc) # or: RESULT=`echo $1+$2 | bc`
}

sum $1 $2

echo $RESULT

[aesteban@localhost ~]$ ./sum.sh 1.7 1.2
2.9

#!/usr/bin/bash

sum()
{
   echo $1+$2 | bc
}

SUMRESULT=`sum $1 $2`

echo $SUMRESULT

[aesteban@localhost ~]$ ./sum.sh 2.9 3
5.9

[aesteban@localhost ~]$ for i in $(seq 1 5); do echo This line corresponds to line $i.;done;
This line corresponds to line 1.
This line corresponds to line 2.
This line corresponds to line 3.
This line corresponds to line 4.
This line corresponds to line 5.
[aesteban@localhost ~]$ 
[aesteban@localhost ~]$ 
[aesteban@localhost ~]$ for i in {1..7}; do echo This is number $i.;done;
This is number 1.
This is number 2.
This is number 3.
This is number 4.
This is number 5.
This is number 6.
This is number 7.
[aesteban@localhost ~]$
[aesteban@localhost var]$ for i in `ls /var`;do echo $i;done;
 ...
[aesteban@localhost ~]$# looping through a list of servers
[aesteban@localhost ~]$for i in {1..5}; do ssh www-app0${i} "cd /var/www/html/barney.com && git pull origin live" ;done;