It seems inconceivable that the purpose of your assignment determining the frequency of word-pairs in a file would be to have you wrap a piped-string of shell utilities in a system call. What does that possibly teach you about C? That a system function exists that allows shell access? Well, it does, and you can, … Read more
To get the date-string in bash: echo “Current: ” $(date +”%Y”-“%m”-“%d”T”%H”-“%M”-“%S”) echo “+2 min : ” $(date –date=”@$(($(date +%s)+120))” +”%Y”-“%m”-“%d”T”%H”-“%M”-“%S”) prints Current: 2014-09-10T15-58-15 +2 min : 2014-09-10T16-00-15 Read the time from string and print +2min string str=”2014-09-10T15-58-15″ new=$(date –date=”@$(($( IFS=”-T” read y m d H M S <<< “$str”;date –date=”$y-$m-${d}T$H:$M:$S” +%s )+120))” +”%Y”-“%m”-“%d”T”%H”-“%M”-“%S”) echo “From … Read more
If you don’t mind pushing this through multiple passes, I might suggest this: Search: ^(Query=.*\n)((?:(?!Query=).*\n)+)\1 Replace: \1\2 Live demo 1 solved How to concatenate multiples lines under first occurence of the header using Unix commands?
This creates a child process which has a copy of the parent’s heap, stack and data space. You need to #include <unistd.h>. You could use this when you want a process to duplicate itself so that the parent and child can each execute different sections of code at the same time. solved will someone explain … Read more
You should read time(7). Be aware that even written in assembler, your program will be rescheduled at arbitrary moments (perhaps a context switch every millisecond; look also into /proc/interrupts and see proc(5)). Then any hardware timer is meaningless. Even using the RDTSC x86-64 machine instruction to read the hardware timestamp counter is useless (since after … Read more
You forgot the ; before do. do counts as a new statement. Alternatively you could place the do on a new line. In my opinion, the most comfortable way to convert DOS line endings (CRLF) to Unix line endings (LF-only) is dos2unix. If you fix your ;error, using dos2unix instead of sed should be straight … Read more
[[ $( find /folder/with/files -type f | wc -l ) -lt 3 ]] && mail -t [email protected] -s Problem <<< “Less than three files.” Find and wc -l return the count of files and then [[ evaluates if the count is lees than three. If this evaluates to true and returns zero exit status, next … Read more
this one-liner should work: awk ‘NR==FNR{a[$1]=substr($0,92,5);next}($1 in a) {$0=substr($0,1,92) a[$1] substr($0,97)}1’ file file2 1 solved Replace characters 92-97 in position “x” on line
You would probably need to use a regular expression to find lines that contain the values you want and to extract them. These lines can then be written in CSV format using Python’s CSV library as follows: import re import csv with open(‘log.txt’) as f_input, open(‘output.csv’, ‘w’, newline=””) as f_output: csv_output = csv.writer(f_output) csv_output.writerow([‘Iteration’, ‘loss’]) … Read more
Here is an easy-to-read solution with Bash and grep: #!/bin/bash while read line ; do if FILE=$(grep -P -o ‘[a-z]*\.txt(?= – Starting)’ <<< “$line”); then F=”$FILE” fi if ! grep ‘\*\*\*\*’ <<< “$line” ; then echo “$line” >> “$F” fi done It gives the following result $ cat file.txt ****************** abc.txt – Starting point ******************** … Read more
Try something simple like cat your-textfile | sed ‘s/october/oct/g’ | sed ‘s/November/nov/g’ If this works for you, further improvements can be made later. solved How to replace multiple string with multiple value with shell script in text file
In GNU awk: $ awk -F”[][]” ‘{split($2,a,”-“); for(i=a[1];i<=a[2];i++) print $1 i $3}’ file app-server-l112.test.com app-server-l113.test.com app-server-l114.test.com app-server-l115.test.com server-l345.test.com server-l346.test.com server-l347.test.com server-l348.test.com dd-server-l2.test.com dd-server-l3.test.com dd-server-l4.test.com split to fields by [ and ] using FS use split the get the range start (a[1]) and end (a[2]) iterate the range with for and output There is no checking … Read more
For any sort of web development, I would recommend apache2. For databases, I would recommend mysql-server or postgresql. For Java (as well as C++ and some others), a popular option is eclipse, although netbeans is also good. If you want to see what’s going on under the hood, wireshark is a great network monitoring utility … Read more
If we read _exit()‘s documentation, we note: Causes normal program termination to occur without completely cleaning the resources. This presumably would include flushing stdout. solved different output with exit() and _exit()?
The operating system stops running the thread receiving the signal and runs the signal handler. When it returns the original thread restarts where it was. If the signal handler is already running when another signal comes in, the action is configurable in the sigaction call. solved How are signals handled in Unix?