Différences

Ci-dessous, les différences entre deux révisions de la page.

--- tech:notes_commande_xargs [2026/04/30 11:20] – Jean-Baptiste
+++ tech:notes_commande_xargs [2026/06/07 19:12] (Version actuelle) – modification externe 127.0.0.1
@@ Ligne 1: / Ligne 1: @@
+<!DOCTYPE markdown>
+{{tag>Brouillon Shell CA}}
+# Notes commande xargs
+Strip char / trim => utiliser `xargs` ex :
+~~~bash
+load5=$(echo $UPTIME | awk -F, '{print $5}' | xargs)
+~~~
+md5sum multithread
+~~~bash
+#find . -not -name "md5sum.txt" -follow -type f -exec md5sum {} \; > md5sum.txt
+find . -not -name "md5sum.txt" -follow -type f -print0 | xargs -0 -L1 -P"$(nproc)" md5sum > md5sum.txt
+~~~
+~~~bash
+dig A +short acme.local | xargs -P5 -I '{}' bash -c 'ping -c 1 -W 2 {} >/dev/null 2>&1 || echo {}'
+~~~
+~~~bash
+cat 20_ok_ping.txt | xargs -L1 -I '{}' -P50 bash -c 'SRV={} ; ssh -p 22 -o PasswordAuthentication=no -o ChallengeResponseAuthentication=no -o PreferredAuthentications=publickey -o StrictHostKeyChecking=no -o ConnectTimeout=3 root@${SRV} true 2>/dev/null && echo +${SRV} || echo -${SRV}' | tee 30_ssh_p22.txt
+~~~
+~~~bash
+pidof sleep | xargs kill -9
+~~~
+Renommer tous les fichiers *.txt d'un répertoire
+~~~bash
+ls -1 ${repertoire}/*.txt | xargs -I {} -t mv {} {}.csv
+~~~
+~~~bash
+cat bash-xargs-demo.txt | xargs -I % sh -c 'echo %; mkdir %'
+xargs -a bash-xargs-demo.txt -I % sh -c 'echo %; mkdir %'
+~~~
+Prompt before launch
+~~~bash
+find * | xargs -p rm -rf
+~~~
+use xargs to copy a file to multiple directories at once; in this example we are trying to copy the file.
+~~~bash
+echo ./Templates/ ./Documents/ | xargs -n 1 cp -v ./Downloads/SIC_Template.xlsx
+~~~
+A la place de '-L' pour le nombre de ligne, il est possible de préciser le nombre d'arguments avec '-n'
+~~~bash
+echo /etc/* |xargs -n 1 basename
+~~~
+Avec délimitateur
+~~~
+$ echo 'my new file' | xargs -d '\n' touch
+$ ls -l
+total 0
+-rw-r--r--. 1 shs shs 0 Oct 15 12:41  file1
+-rw-r--r--. 1 shs shs 0 Oct 15 12:41  file2
+-rw-r--r--. 1 shs shs 0 Oct 15 12:41  file3
+-rw-r--r--. 1 shs shs 0 Oct 15 12:57 'my new file'
+~~~
+~~~
+$ echo "1,2,3,4,5" | xargs -d, echo
+2 3 4 5
+~~~
+~~~
+$ echo "1,2,3,4,5" | xargs -d, -L 1 echo
+~~~
+Copie de fichiers
+~~~bash
+find /backup/ -type f | xargs -n1 -i cp {} /var/www/backup/
+~~~
+Curl - flood
+~~~bash
+seq 1 200 | xargs -n1 -P10  curl "http://localhost:5000/example"
+~~~
+Curl - test urls
+~~~bash
+xargs -a urls.txt -L1 -I '{}' -P50 bash -c 'echo $( curl --connect-timeout 2 -k -s -o /dev/null -w "%{http_code};" "{}" ; echo "{}" )' | tee ping_urls.csv
+~~~
+Curl can now fetch several websites in parallel
+~~~bash
+curl --parallel --parallel-immediate --parallel-max 3 --config websites.txt
+~~~
+`websites.txt`
+~~~python
+url = "website1.com"
+url = "website2.com"
+url = "website3.com"
+~~~
+### xargs avec Ansible
+Voir aussi :
+* [[Ansible - Accélérer Ansible grâce au module Mitogen]]
+* traitements_paralleles [[notes_ansible]]
+~~~bash
+xargs -a inventory.lst -L1 -I % -P50 bash -c "ansible --ssh-common-args='-o StrictHostKeyChecking=no' -i %, -e ansible_port=2222 -b -u admin -m command -a 'grep -q 192\.168\.223\.0 /etc/hosts.allow' all" |tee outpout.log
+~~~
+GB RAM is recommended per 100 forks... about 100MB per fork... The baseline value for [CPU capacity for forks] is 4 forks per core.
+Ref : https://docs.ansible.com/ansible-tower/3.4.3/html/userguide/jobs.html#at-capacity-determination-and-job-impact