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What is the need of including script interpreter in your
shell script?
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Answer Posted / ganesh
When you ask a shell to execute the command $ date, the
shell uses the system call exec to
ask the UNIX kernel to execute the command you requested.
The shell passes the name of the command that should be
executed to the exec system call.
This system call reads the first two characters in a file to
determine how to execute the command.
In the case of shell scripts, the first two characters are
#!, indicating that the script needs to be interpreted by
another program instead of executed directly.
The rest of the line is treated as the name of the
interpreter to use.
Usually the interpreter is /bin/sh, but you can also specify
options to the shell on this line
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on “sed” command EmpData(Sample Database) 1122|j.b. saxena |g.m. |account |12/12/52|6000 2233|n.k. gupta |d.g.m |sales |31/12/40|9000 4545|anil agarwal |director |account |06/07/47|7500 5656|lalit choudhury |executive|marketing|07/09/50|5000 1265|chanchal singhvi|g.m. |admin |12/09/63|6000 0110|shyam saksena |chairman |marketing|12/12/43|8000 5566|jai sharma |director |account |23/12/89|7000 7733|jayant |d.g.m |sales |29/02/70|6000 1. From the above database substitute the delimiter of first 3 lines with “ : “ 2. From the above database substitute the delimiter with “ : ” 3. Insert the string “ XYZ Employees” in the first line. 4. Store the lines pertaining to the directors, d.g.m and g.m into three separate files. 5. Using address store first 4 lines into a file Empupdate. 6. Find the pattern “account” in the database and replaces that with “accounts”. 7. Select those lines which do not have a pattern “g.m”. 8. Insert a blank line after every line in the database.
