linux - diff commnad not working "missing operand after `diff'" -


in diff command getting following error. kindly assist how can specify want see difference in 2 files:

#current_unavail=ranjith  root@iitmserver1 tmp]# cat /tmp/ran ranjith [root@iitmserver1 tmp]#  #test=$(cat /tmp/ran)  [root@iitmserver1 tmp]# diff `$current_unavail` `$test` diff: missing operand after `diff' diff: try `diff --help' more information. [root@iitmserver1 tmp]#

diff takes 2 filenames arguments, appear passing in file contents first argument. want change script/commands more like:

current_unavail=/tmp/unavail_cn.out result=$(diff $current_unavail /moes/home/pharthiphan/scripts/monitoring/unavail_cn/$last_unavail)

alternatively, can use process substitution pass output of command command expecting file. eg:

diff <(echo -e "foo\nbar") <(echo -e "foo\nbaz")

however, while know about, seem needless level of complexity current problem.


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