Created
June 22, 2018 21:11
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bash basic
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#1. print the first 10 lines of /var/log/syslog | |
head -n 10 /var/log/syslog | |
#2. print the last 10 lines of /var/log/syslog | |
tail -n 10 /var/log/syslog | |
#3. print the Nth line of /var/log/syslog | |
sed "100q;d" /var/log/syslog (replace 100 for the line number you want to) | |
#4. print username, uid, gid fields from /etc/passwd | |
cat /etc/passwd | awk '{split($0,a,":"); print a[1],a[3],a[4]}' | |
#5. print disk free space | |
df -k | grep "/$" | awk '{print $4}' show space for / mount in bytes | |
#6. search for the pattern 'error' in /var/log/syslog and print the first matching line | |
grep -e 'error' /var/log/syslog | head -n 1 | |
#7. search for the pattern 'error' in /var/log/syslog and print the last matching line | |
grep -e 'error' /var/log/syslog | tail -n 1 | |
#8. search for the pattern 'error' in /var/log/syslog and print the total count of matching lines | |
grep -c 'error' /var/log/syslog | |
#9. search for the pattern 'error' in /var/log/syslog and print the hourly counts of matching lines | |
grep -r 'error' /var/log/syslog | cut -f 1-3 -d " " | |
#10. write a function that takes a file path as its only argument and prints 'yes' (if file exists) or 'no' (otherwise) | |
function check_file { | |
[[ -f ${1} ]] && echo "yes" || echo "no" | |
} |
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