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Try:
LC_ALL=C tree

Following up on MadeInGermany's more standard sed solution,
I suppose the OP needs something like this:
sed '/^dns\.com$/ {N;N;d;}' /tmp/temp.txt

Try:
sed '/^dns\.com$/,+2d' /tmp/temp.txt

Either use a VM with Linux and ask here or, if you choose Windows, post on the Oracle Forums (https://community.oracle.com/community/database/general_questions/installation).

Yes, you can. You can also use Oracle VirtualBox on Windows to setup
a VM with Oracle Linux (or CentOS) and install Oracle Database on it.

You have installed only the client. You're not able to connect as there's no database ...
Oracle Database Server is not supported on Ubuntu, you can use a free supported
platform like Oracle Linux.

Just for your info:
with GNU awk 4+ you don't need an external program for sorting:

awk 'BEGIN {
# scan arrays by values ASCIIbetical order
PROCINFO["sorted_in"] = "@val_str_asc"
}
{...

As a side note, the shell pattern * won't match filenames that start with a dot
(unless some non-standard shell option similar to bash's dotglob is active) ,
so the above command won't show you...

perl -00e'print sort <>' infile

In the output of vmstat the free memory is in KB, the sar output is in pages.
bash-3.2$ sar -r 1 1

SunOS <name> 5.10 Generic_147440-09 sun4v 05/26/2014

14:23:00 freemem freeswap
14:23:01...

You don't need to do so because neither word splitting nor pathname expansion(globbing) are performed in this context.

Try:
var_path=$PWD
echo "$var_path"
case $var_path in
( *src* ) echo "this $var_path contains 'src'";;
esacOr just:
case $PWD in
( *src* ) echo "this $PWD contains 'src'";;
esac

Remove the prompt and use &1 instead of &client_id.

If I understand correctly:

$ cat a.sql
select &1 from dual;
$ field_name=sysdate
$ sqlplus -s '/ as sysdba' <<EOF
> @a.sql "$field_name"
> EOF
old 1: select &1 from dual
new 1: select...

If Perl is acceptable:
perl -F, -lane'
push @d, [@F];
END {
$, = ",";
for $i (0..$#F) {
push @o, [sort { $a <=> $b } map $d[$_][$i], 0..$#d]
}
for $i (0..$#d) {
...

Well, as always - it depends, but a graceful restart of Apache usually has a limited impact.

To defer the expansion of the variables:

bash-3.00$ su - oracle -c "x=1; echo $x"
Password:
Sun Microsystems Inc. SunOS 5.10 Generic January 2005

bash-3.00$ su - oracle -c "x=1; echo...

Try this:

su - oracle -c "
export ORACLE_SID=BRCFMS
export ORACLE_HOME=/u01/app/oracle/product/11.2.0.3/dbhome_1
export PATH=\$PATH:\$ORACLE_HOME/bin

sqlplus -s scott/tiger <<EOF
spool...

After installing the binaries (the Oracle RDBMS software), you'll need to create the database.

Or:
[ -e "$DIRTOCREATE" ] || mkdir -p -- "$DIRTOCREATE"

Note that you should not use raw devices with Oracle ASM
(raw devices are desupported since Oracle 11.2 - see Announcement on using Raw devices with release 11.2 (Doc ID 754305.1)
and Raw Devices...

Note that the interpretation of metrics like disk utilization's busy and util should be different for modern architectures that use external storage (SAN, NAS etc.).
This post...

Consider the following:
zsh-5.0.0[t]% cat infile
a1
a2
a3
a4
a5
a6
a7
b1
b2
b3
b4
b5
b6
b7
z1
z2
z3
z4

Hm ..., it should be something like this:

awk '{
r = length(r) ? r OFS $0 : $0
}
!(NR % 7) {
print r
r = x
}' infile

awk 'ORS=NR%7?FS:RS' infile