Commands using grep (1,935)
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- grep for the word in a files, use recursion (to find files in sub directories), and list only file matches -| xargs passes the results from the grep command to sed -sed -i uses a regular expression (regex) to evaluate the change: s (search) / search word / target word / g (global replace)
5grep -lr -e '<oldword>' * | xargs sed -i 's/<oldword>/<newword>/g' -
curl(1) is more portable than wget(1) across Unices, so here is an alternative doing the same thing with greater portability. This shell function uses curl(1) to show what site a shortened URL is pointing to, even if there are many nested shortened URLs. This is a great way to test whether or not the shortened URL is sending you to a malicious site, or somewhere nasty that you don't want to visit. The sample output is from:
expandurl http://t.co/LDWqmtDMShow Sample Output5expandurl() { curl -sIL $1 | grep ^Location; } -
This makes your commandlinefu.com's favorites appear as most recent commands in your history.
5(cat ~/.bash_history;U='curl -s www.commandlinefu.com';$U/users/signin -c/tmp/.c -d'username=<USER>&password=<PASS>&submit=1'|$U/commands/favourites/json -b/tmp/.c|grep -Po 'nd":.*?[^\\]",'|sed -re 's/.*":"(.*)",/\1/g')>~/.h;HISTFILE=~/.h bash --login -
This will take the packages matching a given `apt-cache search` query (a collection of AND'd words or regexps) and tell you how popular they are. This is particularly nice for those times you have to figure out which solution to use for e.g. a PDF reader or a VNC client. Substitute "ubuntu.com" for "debian.org" if you want this to use Ubuntu's data instead. Everything else will work perfectly. Show Sample Output
5apt-popcon() { (echo \#rank; apt-cache search "$@" |awk '$1 !~ /^lib/ {print " "$1" "}') |grep -Ff- <(wget -qqO- http://popcon.debian.org/by_inst.gz |gunzip); } -
Output of a command as input to many Show Sample Output
5echo 'foo' | tee >(wc -c) >(grep o) >(grep f) -
Automatically drops mount points that have non-numeric sizes (e.g. /proc). Tested in bash on Linux and AIX. Show Sample Output
5for m in `df -P | awk -F ' ' '{print $NF}' | sed -e "1d"`;do n=`df -P | grep "$m$" | awk -F ' ' '{print $5}' | cut -d% -f1`;i=0;if [[ $n =~ ^-?[0-9]+$ ]];then printf '%-25s' $m;while [ $i -lt $n ];do echo -n '=';let "i=$i+1";done;echo " $n";fi;done -
5lsof -ns | grep REG | grep deleted | awk '{s+=$7/1024} END {print s}'
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weather 97405Show Sample Output5weather() { curl -s "http://www.wunderground.com/q/zmw:$1.1.99999" | grep "og:title" | cut -d\" -f4 | sed 's/°/ degrees F/'; } -
5function hibp() { sha1=$(echo -n "$1"|sha1sum|awk '{print toupper($0)}'|tr -d '\n'); curl -s -H $'Referer: https://haveibeenpwned.com/' https://api.pwnedpasswords.com/range/$(echo -n $sha1|cut -c1-5)|grep -i $(echo -n $sha1|cut -c6-40); }
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5sudo tcpdump -nn -l port 25 | grep -i 'MAIL FROM\|RCPT TO'
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A quick alias to check if a domain is already registered or if it's available for purchase. Show Sample Output
5function canibuy { whois "$1" 2>/dev/null | grep -q 'Registrant' && echo "taken" || echo "available" } -
4tail -f <filename> | grep -C <# of lines to show above and below> <text>
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/proc/cpuinfo contains information about the CPU. Search for "processor" in the /proc/cpuinfo file wc -l, counts the number of lines. Show Sample Output
4grep "processor" /proc/cpuinfo | wc -l -
Get simple description on each file from /bin dir, in list form, usefull for newbies. Show Sample Output
4ls -1 /bin | xargs -l1 whatis 2>/dev/null | grep -v "nothing appropriate" -
Explanation: * The date command evaluated to today's date with blank padded on the left if single digit * The grep command search and highlight today's date * The --before-context and --after-context flags displays up to 6 lines before and after the line containing today's date; thus completes the calendar. I have tested this command on Mac OS X Leopard and Xubuntu 8.10
4cal | grep --before-context 6 --after-context 6 --color -e " $(date +%e)" -e "^$(date +%e)" -
4grep Mar/2009 /var/log/apache2/access.log | awk '{ print $1 }' | sort -n | uniq -c | sort -rn | head
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Find out which RPMs were installed on a particular date. These would (naturally) include update RPMs. This example shows searching for "Thu 05 Mar" (with grep). Alternatively, pipe it to less so you can search inside less (with less's neat text highlighting of the search term): rpm -qa --queryformat '%{installtime} \"%{vendor}\" %{name}-%{version}-%{release} %{installtime:date}\n' | less # (this example) search term: Thu 05 Mar Show Sample Output
4rpm -qa --queryformat '%{installtime} \"%{vendor}\" %{name}-%{version}-%{release} %{installtime:date}\n' | grep "Thu 05 Mar" -
4identify -verbose *.jpg|grep "\(Image:\|Resolution\)"
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4ps auxf | grep httpd | grep -v grep | grep -v defunct | awk '{sum=sum+$6}; END {print sum/1024}'
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4lsof -i | grep -i estab
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The curl command retrieve the HTML text containing the IP address. The grep command picks out the IP address from that HTML text. Show Sample Output
4curl -s checkip.dyndns.org | grep -Eo '[0-9\.]+' -
will display typedefs, structs, unions and functions declared in 'stdio.h'(checkout _IO_FILE structure). It will be helpful if we want to know what a particular header file will offer to us. Command 'cpp' is GNU's C Preprocessor.
4cpp /usr/include/stdio.h | grep -v '^#' | grep -v '^$' | less -
Just a handy way to get all the unique links from inside all the html files inside a directory. Can be handy on scripts etc. Show Sample Output
4find . -name '*.html' -print0| xargs -0 -L1 cat |sed "s/[\"\<\>' \t\(\);]/\n/g" |grep "http://" |sort -u -
I often use "vim -p" to open in tabs rather than buffers.
4vim $(grep test *) -
Retrieve top ip threats from http://isc.sans.org/sources.html and add them into iptables output chain.
4curl -s http://isc.sans.org/sources.html|grep "ipinfo.html"|awk -F"ip=" {'print $2'}|awk -F"\"" {'print $1'}|xargs -n1 sudo iptables -A OUTPUT -j DROP -d > 2&>1 - ‹ First < 6 7 8 9 10 > Last ›
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