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Good news: This is entirely expected and there is no cause for worry at all.

The kernel will use any idle memory for disk cache but gives it up easily at need; you can consider it as "free"...

Removing the g will keep the substitute command from making more than one change on a given line; it will not keep it from changing the 1st occurrence on multiple lines. With the given sample file,...

@michaelrozarl7: keyboard jamming?
Should be

s/\([^,]*,\)\([^,]*,\)\([^,]*,\)/\1\3\2/

In the first sample you use single quotes, in the second you use double quotes. Because of these $0 is processed as a shell variable, so you would need to escape that $-sign (x=\$0). Or try:
...

or enter enter an actual <TAB> instead of \t by using CTRL-V <TAB>

@ michael: the double quotes on the RHS of the expression should be removed at any case otherwise the characters will be interpreted as string. Also, the RHS will not be evaluated using regex but by...

check these
if [[ $answer != [a-zA-Z]*[a-zA-Z0-9_-] ]]; then echo ok; fi
ok


from the bash manual it says for [[ expression ]]
Any part of the pattern may be quoted to force it to be matched...

Consider the following:

% awk --version | head -1;printf '%s\n' a--b-c | awk 'END { print NR } 1' RS=--
GNU Awk 4.0.0
a
b-c

2


$ uname -sr; printf '%s\n' a--b-c | nawk 'END { print NR }...

Yes the output from "df -k" is in kilobytes.

You will often get small differences between the figures for "du" and "df" due to sparse files and open files. Apart from being quicker, "df" is more...

You need one more backslash with the old command substitution command:

export a=`awk -F'\\\^A' '{ print $1 }' file1.sh`

But, of course, you should use the new one $( ... ), if your shell...

When printing error messages. Yes, it does. Do you want error messages ending up anywhere but the console? Usually not. You don't want them in whatever data you're saving from the process, which...

The process is not part of the LHS. These operators are used to open/close files. If for instance I do this:
cat < infileit is implicit notation for this:
cat 0< infileSo in fact the left hand side...

for i in 1 $(seq 200 200 10000)
do
echo $i
done Note that your first step is 199, not 200 so need to be specified separately.

Setting FS to "," on those lines which doesn't contains the "," means that the whole line will be considered as $1 ( first field ) so $1 and $0 would be same in that case.

This never means that...

Hi.

You have the closing backtick in the wrong place, and the echo is not required...

dte=`echo ls -ltr` | tail -1 | awk '{print $6 $7}' | date +%Y%m%d
Should be:

dte=`ls -ltr | tail -1 |...