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Try...diff file[12].csv | awk -F '_|,' '{a[$2]=$0;b[$2]++}END{for(i in a)if(b[i]==1)print a[i]}'

The Advanced Bash-Scripting Guide has some exercises (http://www.tldp.org/LDP/abs/html/exercises.html).

To execute the block, you need to have a slash / on a line of its own, after the END; line.

Try something like...$ string1='3X'

$ case $string1 in [0-9][0-9]) : ;; [0-9]?) string1=${string1:0:1} ;; esac

$ echo $string1
3

$

Try converting the txt file to dos format, via unix2dos or similar, before using uuencode.

Try...$ cat file1
Tom|london
Tom|london
Tom|Paris
Adam|Madrid
Adam|NY
Tom|amsterdam
Tom|amsterdam
Tom|amsterdam
Tom|amsterdam

$ awk -F'|'...

I think the question has already been answered, but to reduce confusion, perhaps include the time zone %Z to see what is happening...
$ date --date "1979-10-26" '+%Y%m%d%H %Z'
1979102600 GMTDT

$...

You can just use sed....sed '/PATTERN/s/ to be changed/, YEHA! to be changed/' FILENAME

I agree that it's difficult to help people when it's difficult to grok the lingo.

try cut

sendmail is usually in /usr/sbin and not on the normal path

The script seems fine to me. Try running it with -x option, as in: sh -x scriptname

Some possible solutions in this thread...
https://www.unix.com/unix-advanced-expert-users/14177-unable-sent-mail-html-format-mailx-command.html

Works fine for me. What system are you on? Do you have nawk or gawk?

Try...awk ' NR == 1 {
from = $2
"date -u +%Y%m%d" | getline to
$NF = to
}
NR == 2 {
"expr $(date -d " to " +%s) - $(date -d "...

Try...awk '$3=="sil"{if(p)print p,$1,w;w="";getline;p=$1}{w=w $3}' file

I thought that file ownership is just a user ID number, which you can see using ls -ln

Try...awk 'c<$1{while(c<$1-1)print ++c,0}{print c=$1,1}' c=-1 file1

Try...$ n='1-3,6,7,9-11'

$ seq 1 14|paste -s|cut -f "$n"|tr '\t' ' '
1 2 3 6 7 9 10 11

$

See... https://www.unix.com/302098992-post2.html

I would guess that it depends on how you remove the top lines. This is at the bash prompt...$ echo x > file1

$ ( ( echo a ; sleep 30 ; echo b ) | tee -a file1 ) &
[1] 7000

$ a


$ sed -i 1d...

Save it as a CSV file and define it as an external table.

Using awk...$ rand=$(awk 'BEGIN{srand();for(i=1;i<=32;i++)printf "%x", int(rand()*16)}')

$ echo $rand
b9645ca2f0c5f55ed1411258d57b5bb5

$

Using your solution and tac...$ cat test.txt
TEST
JOHN
ADAM
MICHAEL
SEBASTIAN
ANDY

$ tac test.txt | sed '/MICHAEL/,+2d' | tac
TEST
SEBASTIAN
ANDY

$

Oh I see the problem. $1 and $2 are local to functions but you are not passing parameters to the function. Perhaps define a and b outside of the functions, e.g...$ cat sh.1
menu ()
{
echo...