1

The following script prints the output down:

/var/lib/ambari-server/resources/scripts/configs.sh get localhost c1 yarn-env

The output of the script:

 "yarn_log_dir_prefix" : "/var/log/hadoop-yarn",
 "yarn_pid_dir_prefix" : "/var/run/hadoop-yarn",
 "yarn_user" : "yarn",
 "yarn_user_nofile_limit" : "32768",
 "yarn_user_nproc_limit" : "65536"

I want to add with pipeline the awk or perl oneline linear, the yarn-env in the first field of output as the following: (expected results)

/var/lib/ambari-server/resources/scripts/configs.sh get localhost c1 yarn-env | awk ...


yarn-env  "yarn_log_dir_prefix" : "/var/log/hadoop-yarn",
yarn-env  "yarn_pid_dir_prefix" : "/var/run/hadoop-yarn",
yarn-env  "yarn_user" : "yarn",
yarn-env  "yarn_user_nofile_limit" : "32768",
yarn-env  "yarn_user_nproc_limit" : "65536"
2
/var/lib/ambari-server/resources/scripts/configs.sh get localhost c1 yarn-env |
awk '{ print "yarn-env", $0 }'

This short awk script will prepend the string yarn-env to each line of input from your command. The delimiter used is the awk variable OFS ("output field separator", a single space by default), so if you want a tab between the two, use

/var/lib/ambari-server/resources/scripts/configs.sh get localhost c1 yarn-env |
awk -vOFS="\t" '{ print "yarn-env", $0 }'

Alternatively, using sed:

/var/lib/ambari-server/resources/scripts/configs.sh get localhost c1 yarn-env |
sed 's/^/yarn-env /'
0

Here is one way with perl:

perl -pe 's/^/yarn_env /'

As you may know, TIMTOWTDI.

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