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Cheatography

By a DevOps, For the DevOps

grep

grep -r pattern
find in files
grep -i pattern
ignore case
grep -o pattern
print file:match
grep -h pattern
hide filename
grep -e pattern -e str2
multiples strings
grep -v pattern
compli­menting line
grep -c pattern
print count
grep -n pattern
print # of matches
grep -w pattern
match whole pattern

find

find path -type f -name file
search only filenames
find path -type d -name dir
search only dir names
find path -mtime +7 -ls
older than 7 days
find path -size -10M -ls
less than 10 MB G/K
find path -exec grep -i str {} +
find in files

du

du -a dir
all files
du -h dir
human
du -m dir
in mb
du -c dir
sum
du -s dir
only sum
du --max-­depth=1 dir
1 dir level deep

loops

seq 5 | xargs -I{} cmd
for i in {1..5};
do
    date;
done
for vm in web log db;
do
    uptime;
done

tar

tar cvf f.tar f1 f2 f3 ...
create tar
tar xvf f.tar
extract tar
tar tvf f.tar
view tar

sed

sed -i'.bak' 's/old­/new/g'
replace after backup
sed 's/ab/­xy/­g;s­/de­/pq/g'
multiple replaces
sed '10,20 s/abc/­xyz/g'
replace in range

awk

awk -F',' '{print $1"@­"$3}'
print col1@col3
awk -F'\t' '/str/ {print $0}'
print line with str
awk -F: '{print $(NF-1)}'
print II col from right
awk -F'(,|­:|;)' '{print }'
multiple separators
awk '$1 == 100 {print}'
comparison <, >, <=, >=
awk 'END {print NR " & " NF}'
print # of rows and cols
awk 'BEGIN {action} /pattern/ END {action}'
 

stdin stdout

cmd 1>f.out
stdout to f.out
cmd 1>f.out
stderr to f.out
cmd &>­f.out
stdout and stderr to f.out

sort

sort -n
numeric
sort -r
reverse

uniq

uniq -c
print count
uniq -d
only dups
uniq -u
only unique
uniq -i
ignore case
ideally uniq should be used after sort

cut

cut -d ',' -f 1,3,5
print csv cols 1, 3 and 5
cut -d: -f 1 --comp­liment
print all cols except 1
cut -f -3
print cols 1, 2 and 3
cut -f 3-
print cols 3, 4 ...

tr

tr old new
replace old with new
tr -s ' '
replace multiple space with single
typical use: cat something | tr old new

curl

curl -o file url
save to file
curi -I url
only header
curl -k https:­//url
ignore cert
curl -u <us­r:p­wd> url
username password
curl -w
add timeout

misc 1

top
cpu mem info
free -m
mem status
lsof
open files
netstat
nw traffic
dig servername
dns
nslookup servername
dns
time cmd
exe time
watch cmd
auto exe
zip -d f.zip fname
delete file from zip
umount -l mnt
unmount when free
mount -a
mount all
ln -s file link
create symlink

misc 2

| xargs cmd
throws what pipe gave after cmd
ps -ef
list processes
nc -l 1234
listen on 1234
nc 127.0.0.1 1234
send data to 1234
cp -p old new
cp permis­sions also
       
 

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