mjhjmtu

ls /proc/
1 10984 11246 131 144 167 2099 31788 4805 5375 6762 7594 8111 8722 consoles
10 10993 11247 1314 14400 168 21 32 4807 5379 6771 76 8112 8738 cpuinfo
100 10998 11248 13163 14403 169 210 32408 4818 5386 6788 7601 8113 8752 crypto
101 11 11249 132 14404 17 211 33 4831 5388 68 7619 8114 8768 devices
102 110 11251 133 14405 170 2111 34 4833 54 6808 7625 8115 8789 diskstats
10202 11012 11252 134 14406 1726 2115 3489 4846 5417 6827 7626 8116 88 dma

cat /proc/10993/root/run_command
/usr/sbin/libvirtd --listen(nova-libvirt)

and I want to get all PID run_command

cd /proc
cat */root/run_command
/etc/barbican/vassals --logto /var/log/kolla/barbican/barbican-api.loguwsgi --master --emperor /etc/barbican/vassals --logto /var/log/kolla/barbican/barbican-api.loguwsgi --master --emperor /etc/barbican/vassals --logto /var/log/kolla/barbican/barbican-api.log/opt/kibana/bin/kibanabarbican-keystone-listenerbarbican-keystone-listenerheat-api-cfnheat-api-cfnneutron-dhcp-agent --config-file /etc/neutron/neutron.conf --config-file /etc/neutron/dhcp_agent.inimistral-server --server executor --config-file /etc/mistral/mistral.confneutron-dhcp-agent --config-file /etc/neutron/neutron.conf --config-file /etc/neutron/dhcp_agent.inimistral-server --server executor --config-file /etc/mistral/mistral.conf/usr/sbin/sshd -Dtacker-server --config-file /etc/tacker/tacker.conf/usr/sbin/sshd -Dtacker-server --config-file /etc/tacker/tacker.conf/usr/sbin/apache2/usr/sbin/td-agent/usr/bin/mysqld_safeglance-registry/usr/sbin/apache2start-ovsdb-server 127.0.0.1/usr/bin/mysqld_safeglance-registrynova-apistart-ovsdb-server 127.0.0.1nova-consoleauthnova-api/usr/sbin/libvirtd --listennova-consoleauth/usr/bin/memcached -v -l 10.60.6.174 -p 11211 -c 5000 -U 0/usr/bin/memcached -v -l 10.60.6.174 -p 11211 -c 5000 -U 0/usr/sbin/libvirtd --listenneutron-metadata-agent --config-file /etc/neutron/neutron.conf --config-file /etc/neutron/metadata_agent.ini/usr/sbin/libvirtd --listenmistral-server --server engine --config-file /etc/mistral/mistral.confneutron-metadata-agent --config-file /etc/neutron/neutron.conf --config-file /etc/neutron/metadata_agent.inimistral-server --server engine --config-file /etc/mistral/mistral.confstart-ovsdb-server 127.0.0.1/usr/share/elasticsearch/bin/elasticsearchsleep infinity/usr/share/elasticsearch/bin/elasticsearchbarbican-workersleep infinitynova-conductorbarbican-worker/opt/kafka/bin/kafka-server-start.sh /etc/kafka/kafka.server.propertiesnova-compute/usr/sbin/libvirtd --listen/usr/sbin/apache2/usr/sbin/apache2/usr/sbin/apache2/usr/sbin/apache2/usr/sbin/apache2/usr/sbin/apache2/usr/sbin/apache2/usr/sbin/apache2/usr/sbin/apache2/usr/sbin/apache2/usr/sbin/apache2/usr/sbin/apache2no ...

but it's too messy to read.
How do I put each record (content of each file) on a separate line?

run_comand_content1
run_comand_content2
run_comand_content3

or

run_comand_content1

run_comand_content2

run_comand_content3

You could put it in a loop:

for i in /proc/[0-9]* 
do
 printf "$it"
 cat $i/root/run_command
 printf "n" 
done

You can use awk:

awk 'FNR==1printf ""1' */root/run_command

or separate by --- or new line:

awk 'FNR==1print "---"1' */root/run_command
awk 'FNR==1printf "n"1' */root/run_command

See here for more answers, e.g. using sed:

sed -e '$s/$/n/' -s */root/run_command