ssh远程登陆时一些命令无法使用

在180 ssh 到另一台服务器179 执行命令时报错

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[root@180 sbin]# ssh 179 -p 60022 "mapred --help"
bash: mapred: 未找到命令

但实际在179 可以执行该命令
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[root@179 sbin]# mapred --help
Usage: mapred [OPTIONS] SUBCOMMAND [SUBCOMMAND OPTIONS]
or mapred [OPTIONS] CLASSNAME [CLASSNAME OPTIONS]
where CLASSNAME is a user-provided Java class

OPTIONS is none or any of:

--config dir Hadoop config directory
--debug turn on shell script debug mode
--help usage information

SUBCOMMAND is one of:


Admin Commands:

frameworkuploader mapreduce framework upload
hsadmin job history server admin interface

Client Commands:

classpath prints the class path needed for running mapreduce subcommands
envvars display computed Hadoop environment variables
job manipulate MapReduce jobs
minicluster CLI MiniCluster
pipes run a Pipes job
queue get information regarding JobQueues
sampler sampler
version print the version

Daemon Commands:

historyserver run job history servers as a standalone daemon

SUBCOMMAND may print help when invoked w/o parameters or with -h.

这是 ssh 在登录远程的环境变量中不包含可执行文件的路径, 所以要自己加上路径

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[root@180 sbin]# ssh 179 -p 60022 "/usr/local/hadoop/hadoop-3.2.2/bin/mapred --help"
Usage: mapred [OPTIONS] SUBCOMMAND [SUBCOMMAND OPTIONS]
or mapred [OPTIONS] CLASSNAME [CLASSNAME OPTIONS]
where CLASSNAME is a user-provided Java class

OPTIONS is none or any of:

tput: No value for $TERM and no -T specified
--config dir Hadoop config directory
--debug turn on shell script debug mode
--help usage information

SUBCOMMAND is one of:


Admin Commands:

tput: No value for $TERM and no -T specified
frameworkuploader mapreduce framework upload
hsadmin job history server admin interface

Client Commands:

tput: No value for $TERM and no -T specified
classpath prints the class path needed for running mapreduce
subcommands
envvars display computed Hadoop environment variables
job manipulate MapReduce jobs
minicluster CLI MiniCluster
pipes run a Pipes job
queue get information regarding JobQueues
sampler sampler
version print the version

Daemon Commands:

tput: No value for $TERM and no -T specified
historyserver run job history servers as a standalone daemon

SUBCOMMAND may print help when invoked w/o parameters or with -h.

这样就可以执行了

shell脚本

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