Exam 200-901 topic 1 question 168 discussion

Actual exam question from Cisco's 200-901

Question #: 168
Topic #: 1

FILL BLANK -
Fill in the blanks to complete the Bash script in which each file in a directory is renamed to its SHA256 hash?

TARGET_DIR=/usr/local/certs -
for f in '__________ __________'; do
__________ $f' openssl sha -sha256 -r < $f | cut -f1 -cl' ''

Show Suggested Answer

Suggested Answer: See explanation below.
TARGET_DIR=/usr/local/certs -
for f in '/usr/local/certs'; do
echo $f' openssl sha -sha256 -r < $f | cut -f1 -cl' ''

by batmantm at Dec. 2, 2020, 3:01 p.m.

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valbonarexhepi

Highly Voted 1 year, 7 months ago

ls $TARGET_DIR mv

upvoted 34 times

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batmantm

Highly Voted 1 year, 7 months ago

for f in : ls $TARGET_DIR mv

upvoted 8 times

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SY_MOEW

Most Recent 1 week, 4 days ago

user@devnetops-srv:~$ cat script.sh TARGET_DIR=/home/user/cert for f in `ls $TARGET_DIR`; do echo $f done user@devnetops-srv:~$ ls ./cert/ 1.txt 2.txt 3.txt user@devnetops-srv:~$ ./script.sh 1.txt 2.txt 3.txt

upvoted 1 times

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mtempeo

1 year ago

ls $TARGET_DIR mv "

upvoted 2 times

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blalw

1 year, 5 months ago

for f in 'ls $TARGET_DIR' do mv..., not sure where it is correct, from my experience the most similar i can run is: for f in $(ls $TARGET_DIR) do mv.... can someone elaborate? thanks

upvoted 1 times

flox

1 year, 5 months ago

use ` instead '

upvoted 3 times

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Elvkoo

1 year, 7 months ago

$TARGET_DIR/* mv

upvoted 5 times

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Sliking

1 year, 7 months ago

I don't get this script... Shouldn't it be something like this: for f in *; do mv $f $(openssl sha256 -r < $f | cut -d " " -f 1); done I tried with 'ls $TARGET_DIR' and it just prints the command which results in an error: "mv: cannot stat 'ls': No such file or directory" Regarding the cut command we can use either -f or -c according to documentation, why are they using both? Also the default delimiter is TAB which would result in the string having 'stdin' at the end. We need to change that with the -d option.

upvoted 2 times

geex

1 year, 4 months ago

Single quotes (') in this example most probably should be back-ticks (`). But essentially it comes down to: - list files in directory (eg. `ls $TARGET_DIR`) - move each file (eg. `mv $f `openssl....`)

upvoted 3 times

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