adding # at the beginning of every line in a text file.
[root@master ~]# cat /tmp/a
179 ls -l /opt/OS_Image/BaseOS/repodata/repomd.xml
180 vi /etc/yum.repos.d/rhel8.repo
181 yum search cockpit
182 yum install cockpit
183 systemctl status cockpit
184 systemctl status cockpit.socket
185 systemctl enable --now cockpit.socket
186 systemctl status cockpit
187 systemctl status cockpit.socket
188 ifconfig
189 ip a s
190 su - sam
192 service auditd rotate
193 service auditd rotate 2>&1 | /bin/sed -r "s/\x1B\[([0-9]{1,2}(; [0-9]{1,2})?[m|k]//g"
194 pwd
195 clear
196 vi /tmp/a
[root@master ~]# cat /tmp/a | awk '{first = $1; $1 = " "; print "#" $0 }'
# ls -l /opt/OS_Image/BaseOS/repodata/repomd.xml
# vi /etc/yum.repos.d/rhel8.repo
# yum search cockpit
# yum install cockpit
# systemctl status cockpit
# systemctl status cockpit.socket
# systemctl enable --now cockpit.socket
# systemctl status cockpit
# systemctl status cockpit.socket
# ifconfig
# ip a s
# su - sam
# service auditd rotate
# service auditd rotate 2>&1 | /bin/sed -r "s/\x1B\[([0-9]{1,2}(; [0-9]{1,2})?[m|k]//g"
# pwd
# clear
# vi /tmp/a
#
[root@master ~]#
Move first field to last and everything on same position.
[root@master ~]# cat /tmp/a | awk '{first = $1; $1 = " "; print "#" $0, first; }'
# ls -l /opt/OS_Image/BaseOS/repodata/repomd.xml 179
# vi /etc/yum.repos.d/rhel8.repo 180
# yum search cockpit 181
# yum install cockpit 182
# systemctl status cockpit 183
# systemctl status cockpit.socket 184
# systemctl enable --now cockpit.socket 185
# systemctl status cockpit 186
# systemctl status cockpit.socket 187
# ifconfig 188
# ip a s 189
# su - sam 190
# service auditd rotate 192
# service auditd rotate 2>&1 | /bin/sed -r "s/\x1B\[([0-9]{1,2}(; [0-9]{1,2})?[m|k]//g" 193
# pwd 194
# clear 195
# vi /tmp/a 196
#
[root@master ~]#
