Q1 How do you remove the Control-M characters from a file? A1 Using the sed command that replaces Control-M with nothing
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sed 's/^M//g' ReadWriteFile.sh > ReadWriteFileNew.sh |
Note: The ^M is typed on the command…
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Home › Java & Big Data Interview Q&As › ➡ Tutorials › Tutorials - Enterprise Java › TUT - Other › Archive for TUT – Unix
Blog Archives
03: Shell script interview Q&As for Java developers
Q1 How will you go about reading a CSV file as shown below?
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Portfolio,Account,PositionIndicator,Amount AA123,CURR-AUD,CREDIT,2244.14000000 AA123,CURR-AUD,CREDIT,5.60000000 AA123,CURR-AUD,DEBIT,2249.74000000 AA123,CURR-GBP,CREDIT,0.01000000 AA123,CURR-GBP,DEBIT,0.01000000 |
A1
SSH Login without password so that tasks can be automated via shell scripts
Prerequisite
If “openssh-server” & “openssh-client” are not installed in say “hostA”, then install them in “hostA” using “apt-get” with “sudo” for actions with root user privileges.
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userA@hostA:~> sudo apt-get install openssh-server openssh-client |
Setting up passwordless connection
The aim is to connect from “hostA” as “userA” to “hostB” as “userB” without being prompted to enter the password for userB@hostB.…
Unix remoting interview Q&A for Java developers
Q1 How will you delete files that are older than 7 days in a remote unix server? A1 By ssh ing to the remote host server
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ssh user@host123 "find /etc/data/*.csv -mtime +7 -exec rm -f {} \;" >> myapp. |
Unix Sed commands for Java developers
sed (stream editor) is one of the powerful workhorse commands in UNIX. Recently I had to use it with “Git” and “Maven” to find text “SNAPSHOT” in all pom.xml files, and manually update them with a realease version like 1.0.2 without the suffix “SNAPSHOT”. Here is the command that I ran.…
Unix shell script to upload & download data between HDFS and edge node
In BigData projects relating to HDFS or AWS S3, it is common to have scripts that transfer or download data from HDFS to the local file system on an edge…
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Unix tutorial with MobaXterm
Many industrial Java applications are developed om a WIN32 platfor, but run on a target platform, which is Unix based. If you are a beginner to Unix, and would like…
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