System Commands, OPPE 1

September 2023 term, Set 1

Quiz Space

MusicOpen the study music controls.

CalculatorOpen the calculatorLearning mode

Question 1

+15−0Instructions

QuestionTest casesSolution

Error Handling requires one to understand exit status implementation. Write a function which will echo "Success" if there are 3 arguments passed to it and print all the three arguments. The exit status of any more or less arguments passed to the function should end up in exit status of 1.

Hint: Use return keyword

Code Editor

Bash

−14+

ResetNot submitted

#!/usr/bin/env bash
# Write your script here

#!/usr/bin/env bash # Write your script here

Run sample testsSubmit

Submit this paper?

You cannot change your answers after submitting.

Answered

0

Not answered

1

Marked for review

0

Answered & marked for review

0

Not visited

2

Keep goingSubmit paper

Instructions

The palette shows the status of every question. Pick a number to go straight to it.

Answered

0

Not answered

1

Marked for review

0

Answered & marked for review

0

Not visited

2

• Save & Next moves to the next question. Answers are saved as you go.
• Mark for Review & Next flags the question to come back to. A flagged answer still counts.
• Clear Response removes your answer to the question on screen.
• The ← and → keys move to the previous and next question.

Error Handling requires one to understand exit status implementation. Write a function which will echo "Success" if there are 3 arguments passed to it and print all the three arguments. The exit status of any more or less arguments passed to the function should end up in exit status of 1. Hint: Use return keyword Sanjay is a professional photographer who capture photos of items for various clients. The photos database has thousands of photos collected each year. The photographs are stored in jpg format using `YYYYMMDD_HHMMSS.jpg` naming convention. For his backup purpose he wants to organize his data by moving the photos to a new directory created using monthYear (Ex: Jan2021) format (thus 12 directory for each year). Write a shell script which will create folders based on the image name and creates and moves it to the respective month directory. **Hint:** ```bash $ date --help Usage: date [OPTION]... [+FORMAT] or: date [-u|--utc|--universal] [MMDDhhmm[[CC]YY][.ss]] Display date and time in the given FORMAT. With -s, or with [MMDDhhmm[[CC]YY][.ss]], set the date and time. Mandatory arguments to long options are mandatory for short options too. -d, --date=STRING display time described by STRING, not 'now' ... FORMAT controls the output. Interpreted sequences are: %% a literal % %a locale's abbreviated weekday name (e.g., Sun) %A locale's full weekday name (e.g., Sunday) %b locale's abbreviated month name (e.g., Jan) %B locale's full month name (e.g., January) %c locale's date and time (e.g., Thu Mar 3 23:05:25 2005) %C century; like %Y, except omit last two digits (e.g., 20) %d day of month (e.g., 01) %D date; same as %m/%d/%y %e day of month, space padded; same as %_d %F full date; like %+4Y-%m-%d %g last two digits of year of ISO week number (see %G) %G year of ISO week number (see %V); normally useful only with %V %h same as %b %H hour (00..23) %I hour (01..12) %j day of year (001..366) %k hour, space padded ( 0..23); same as %_H %l hour, space padded ( 1..12); same as %_I %m month (01..12) %M minute (00..59) %n a newline %N nanoseconds (000000000..999999999) %p locale's equivalent of either AM or PM; blank if not known %P like %p, but lower case %q quarter of year (1..4) %r locale's 12-hour clock time (e.g., 11:11:04 PM) %R 24-hour hour and minute; same as %H:%M %s seconds since the Epoch (1970-01-01 00:00 UTC) %S second (00..60) %t a tab %T time; same as %H:%M:%S %u day of week (1..7); 1 is Monday %U week number of year, with Sunday as first day of week (00..53) %V ISO week number, with Monday as first day of week (01..53) %w day of week (0..6); 0 is Sunday %W week number of year, with Monday as first day of week (00..53) %x locale's date representation (e.g., 12/31/99) %X locale's time representation (e.g., 23:13:48) %y last two digits of year (00..99) %Y year %z +hhmm numeric time zone (e.g., -0400) %:z +hh:mm numeric time zone (e.g., -04:00) %::z +hh:mm:ss numeric time zone (e.g., -04:00:00) %:::z numeric time zone with : to necessary precision (e.g., -04, +05:30) %Z alphabetic time zone abbreviation (e.g., EDT) ... Examples: Convert seconds since the Epoch (1970-01-01 UTC) to a date $ date --date='@2147483647' Show the time on the west coast of the US (use tzselect(1) to find TZ) $ TZ='America/Los_Angeles' date Show the local time for 9AM next Friday on the west coast of the US $ date --date='TZ="America/Los_Angeles" 09:00 next Fri' ... ``` Write a bash script which works on output of `ls -li` to produce an output which will have unique list of files which are not softlinks and has only one file for multiple hardlinks present. Note: The final output should be sorted by ascending order of inode number. Hint: Output of the `ls -li` is given in a file sample.txt. **`sample.txt` File** ```bash 12 -rwxr-xr-x 1 root root 1113504 Apr 18 2022 bash 13 -rwxr-xr-x 1 root root 716464 Mar 13 2018 btrfs 14 -rwxr-xr-x 1 root root 375952 Mar 13 2018 btrfs-debug-tree 15 -rwxr-xr-x 1 root root 371856 Mar 13 2018 btrfs-find-root 16 -rwxr-xr-x 1 root root 396432 Mar 13 2018 btrfs-image 17 -rwxr-xr-x 1 root root 375952 Mar 13 2018 btrfs-map-logical 18 -rwxr-xr-x 1 root root 371856 Mar 13 2018 btrfs-select-super 19 -rwxr-xr-x 1 root root 371856 Mar 13 2018 btrfs-zero-log 20 lrwxrwxrwx 1 root root 5 Mar 13 2018 btrfsck -> btrfs 21 -rwxr-xr-x 1 root root 375952 Mar 13 2018 btrfstune 22 -rwxr-xr-x 3 root root 34888 Jul 4 2019 bunzip2 23 -rwxr-xr-x 1 root root 2062296 Nov 25 2021 busybox 22 -rwxr-xr-x 3 root root 34888 Jul 4 2019 bzcat 24 lrwxrwxrwx 1 root root 6 Jul 4 2019 bzcmp -> bzdiff 25 -rwxr-xr-x 1 root root 2140 Jul 4 2019 bzdiff 26 lrwxrwxrwx 1 root root 6 Jul 4 2019 bzegrep -> bzgrep 27 -rwxr-xr-x 1 root root 4877 Jul 4 2019 bzexe 28 lrwxrwxrwx 1 root root 6 Jul 4 2019 bzfgrep -> bzgrep 29 -rwxr-xr-x 1 root root 3642 Jul 4 2019 bzgrep ```